21880656388 has 12 divisors (see below), whose sum is σ = 38292261952. Its totient is φ = 10940010120.

The previous prime is 21880656349. The next prime is 21880656409. The reversal of 21880656388 is 88365608812.

It is a happy 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, 146881 + ... + 255607.

Almost surely, 2^21880656388 is an apocalyptic number.

It is an amenable number.

21880656388 is a deficient number, since it is larger than the sum of its proper divisors (16411605564).

21880656388 is a wasteful number, since it uses less digits than its factorization.

21880656388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159042 (or 159040 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 21880656388 in words is "twenty-one billion, eight hundred eighty million, six hundred fifty-six thousand, three hundred eighty-eight".