21551444922988 has 12 divisors (see below), whose sum is σ = 37871522511592. Its totient is φ = 10731009919680.

The previous prime is 21551444922923. The next prime is 21551444923009. The reversal of 21551444922988 is 88922944415512.

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, 11178134370 + ... + 11178136297.

Almost surely, 2^{21551444922988} is an apocalyptic number.

It is an amenable number.

21551444922988 is a deficient number, since it is larger than the sum of its proper divisors (16320077588604).

21551444922988 is a wasteful number, since it uses less digits than its factorization.

21551444922988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22356270912 (or 22356270910 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 64.

The spelling of 21551444922988 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred forty-four million, nine hundred twenty-two thousand, nine hundred eighty-eight".