21305792902 has 16 divisors (see below), whose sum is σ = 33111373824. Its totient is φ = 10271205000.

The previous prime is 21305792891. The next prime is 21305792957. The reversal of 21305792902 is 20929750312.

It is a super-2 number, since 2×21305792902² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617224 + ... + 650827.

It is an arithmetic number, because the mean of its divisors is an integer number (2069460864).

Almost surely, 2^21305792902 is an apocalyptic number.

21305792902 is a deficient number, since it is larger than the sum of its proper divisors (11805580922).

21305792902 is a wasteful number, since it uses less digits than its factorization.

21305792902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268355.

The product of its (nonzero) digits is 68040, while the sum is 40.

The spelling of 21305792902 in words is "twenty-one billion, three hundred five million, seven hundred ninety-two thousand, nine hundred two".