21656016336 has 40 divisors (see below), whose sum is σ = 57873840480. Its totient is φ = 6969751936.

The previous prime is 21656016329. The next prime is 21656016359. The reversal of 21656016336 is 63361065612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21656016294 and 21656016303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7777350 + ... + 7780133.

It is an arithmetic number, because the mean of its divisors is an integer number (1446846012).

Almost surely, 2^21656016336 is an apocalyptic number.

It is an amenable number.

21656016336 is an abundant number, since it is smaller than the sum of its proper divisors (36217824144).

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

21656016336 is a wasteful number, since it uses less digits than its factorization.

21656016336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15557523 (or 15557517 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 21656016336 in words is "twenty-one billion, six hundred fifty-six million, sixteen thousand, three hundred thirty-six".