21656306130910 has 64 divisors (see below), whose sum is σ = 43180734901248. Its totient is φ = 7753900000000.

The previous prime is 21656306130847. The next prime is 21656306130917. The reversal of 21656306130910 is 1903160365612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21656306130917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4121535 + ... + 7765285.

It is an arithmetic number, because the mean of its divisors is an integer number (674698982832).

Almost surely, 2^{21656306130910} is an apocalyptic number.

21656306130910 is a deficient number, since it is larger than the sum of its proper divisors (21524428770338).

21656306130910 is a wasteful number, since it uses less digits than its factorization.

21656306130910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644601.

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 21656306130910 in words is "twenty-one trillion, six hundred fifty-six billion, three hundred six million, one hundred thirty thousand, nine hundred ten".