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102100321 = 642115901
BaseRepresentation
bin1100001010111…
…10110101100001
321010010020022101
412011132311201
5202114202241
614044210401
72346560401
oct605366541
9233106271
10102100321
11526a6534
122a239a01
13181ca7bb
14d7ba801
158e6be31
hex615ed61

102100321 has 4 divisors (see below), whose sum is σ = 102122644. Its totient is φ = 102078000.

The previous prime is 102100307. The next prime is 102100331. The reversal of 102100321 is 123001201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123001201 = 222155381.

It can be written as a sum of positive squares in 2 ways, for example, as 74390625 + 27709696 = 8625^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100321 - 211 = 102098273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102100298 and 102100307.

It is not an unprimeable number, because it can be changed into a prime (102100301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530 + ... + 14371.

It is an arithmetic number, because the mean of its divisors is an integer number (25530661).

Almost surely, 2102100321 is an apocalyptic number.

It is an amenable number.

102100321 is a deficient number, since it is larger than the sum of its proper divisors (22323).

102100321 is an equidigital number, since it uses as much as digits as its factorization.

102100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22322.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 102100321 is about 10104.4703473265. The cubic root of 102100321 is about 467.3860032610.

Adding to 102100321 its reverse (123001201), we get a palindrome (225101522).

The spelling of 102100321 in words is "one hundred two million, one hundred thousand, three hundred twenty-one".

Divisors: 1 6421 15901 102100321