102042121 has 4 divisors (see below), whose sum is σ = 102787092. Its totient is φ = 101297152.

The previous prime is 102042089. The next prime is 102042131. The reversal of 102042121 is 121240201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121240201 = 1913 ⋅63377.

It can be written as a sum of positive squares in 2 ways, for example, as 89510521 + 12531600 = 9461^2 + 3540^2 .

It is a cyclic number.

It is not a de Polignac number, because 102042121 - 2⁵ = 102042089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102042131) 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, 372280 + ... + 372553.

It is an arithmetic number, because the mean of its divisors is an integer number (25696773).

Almost surely, 2^102042121 is an apocalyptic number.

It is an amenable number.

102042121 is a deficient number, since it is larger than the sum of its proper divisors (744971).

102042121 is an equidigital number, since it uses as much as digits as its factorization.

102042121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744970.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 102042121 is about 10101.5900233577. The cubic root of 102042121 is about 467.2971787422.

Adding to 102042121 its reverse (121240201), we get a palindrome (223282322).

The spelling of 102042121 in words is "one hundred two million, forty-two thousand, one hundred twenty-one".