102690921 has 8 divisors (see below), whose sum is σ = 138849984. Its totient is φ = 67496240.

The previous prime is 102690919. The next prime is 102690961. The reversal of 102690921 is 129096201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102690921 - 2¹ = 102690919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102690961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240846 + ... + 241271.

It is an arithmetic number, because the mean of its divisors is an integer number (17356248).

Almost surely, 2^102690921 is an apocalyptic number.

It is an amenable number.

102690921 is a deficient number, since it is larger than the sum of its proper divisors (36159063).

102690921 is an equidigital number, since it uses as much as digits as its factorization.

102690921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482191.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 102690921 is about 10133.6528951805. The cubic root of 102690921 is about 468.2854703292.

The spelling of 102690921 in words is "one hundred two million, six hundred ninety thousand, nine hundred twenty-one".