21304902 has 8 divisors (see below), whose sum is σ = 42609816. Its totient is φ = 7101632.

The previous prime is 21304897. The next prime is 21304919. The reversal of 21304902 is 20940312.

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

21304902 is an admirable number.

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, 1775403 + ... + 1775414.

It is an arithmetic number, because the mean of its divisors is an integer number (5326227).

Almost surely, 2^21304902 is an apocalyptic number.

21304902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21304902 is a wasteful number, since it uses less digits than its factorization.

21304902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550822.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21304902 is about 4615.7233452624. The cubic root of 21304902 is about 277.2212475566.

The spelling of 21304902 in words is "twenty-one million, three hundred four thousand, nine hundred two".