21956110891076 has 48 divisors (see below), whose sum is σ = 39674143192320. Its totient is φ = 10626675966720.

The previous prime is 21956110891063. The next prime is 21956110891081. The reversal of 21956110891076 is 67019801165912.

It is a super-2 number, since 2×21956110891076² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 16339256 + ... + 17631888.

It is an arithmetic number, because the mean of its divisors is an integer number (826544649840).

Almost surely, 2^{21956110891076} is an apocalyptic number.

It is an amenable number.

21956110891076 is a deficient number, since it is larger than the sum of its proper divisors (17718032301244).

21956110891076 is a wasteful number, since it uses less digits than its factorization.

21956110891076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293804 (or 1293802 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 56.

The spelling of 21956110891076 in words is "twenty-one trillion, nine hundred fifty-six billion, one hundred ten million, eight hundred ninety-one thousand, seventy-six".