102642921 has 24 divisors (see below), whose sum is σ = 160293120. Its totient is φ = 63071136.

The previous prime is 102642907. The next prime is 102642929. The reversal of 102642921 is 129246201.

102642921 is a `hidden beast` number, since 10 + 2 + 642 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 102642921 - 2¹⁰ = 102641897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102642929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1785 + ... + 14438.

It is an arithmetic number, because the mean of its divisors is an integer number (6678880).

Almost surely, 2^102642921 is an apocalyptic number.

It is an amenable number.

102642921 is a deficient number, since it is larger than the sum of its proper divisors (57650199).

102642921 is a wasteful number, since it uses less digits than its factorization.

102642921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16285 (or 16282 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 102642921 is about 10131.2842719963. The cubic root of 102642921 is about 468.2124966412.

The spelling of 102642921 in words is "one hundred two million, six hundred forty-two thousand, nine hundred twenty-one".