21102902 has 8 divisors (see below), whose sum is σ = 31677912. Its totient is φ = 10543600.

The previous prime is 21102883. The next prime is 21102911. The reversal of 21102902 is 20920112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377 + ... + 6507.

It is an arithmetic number, because the mean of its divisors is an integer number (3959739).

Almost surely, 2^21102902 is an apocalyptic number.

21102902 is a deficient number, since it is larger than the sum of its proper divisors (10575010).

21102902 is a wasteful number, since it uses less digits than its factorization.

21102902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21102902 is about 4593.7895032315. The cubic root of 21102902 is about 276.3423166277.

The spelling of 21102902 in words is "twenty-one million, one hundred two thousand, nine hundred two".