102221021 has 4 divisors (see below), whose sum is σ = 116824032. Its totient is φ = 87618012.

The previous prime is 102220997. The next prime is 102221071. The reversal of 102221021 is 120122201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120122201 = 313 ⋅383777.

It is a cyclic number.

It is not a de Polignac number, because 102221021 - 2⁶ = 102220957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102220993 and 102221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221071) 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, 7301495 + ... + 7301508.

It is an arithmetic number, because the mean of its divisors is an integer number (29206008).

Almost surely, 2^102221021 is an apocalyptic number.

It is an amenable number.

102221021 is a deficient number, since it is larger than the sum of its proper divisors (14603011).

102221021 is an equidigital number, since it uses as much as digits as its factorization.

102221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14603010.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 102221021 is about 10110.4411872084. The cubic root of 102221021 is about 467.5701074000.

Adding to 102221021 its reverse (120122201), we get a palindrome (222343222).

The spelling of 102221021 in words is "one hundred two million, two hundred twenty-one thousand, twenty-one".