21105072712 has 32 divisors (see below), whose sum is σ = 41000126400. Its totient is φ = 10172835904.

The previous prime is 21105072697. The next prime is 21105072721. The reversal of 21105072712 is 21727050112.

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 7 ways as a sum of consecutive naturals, for example, 79803 + ... + 220405.

It is an arithmetic number, because the mean of its divisors is an integer number (1281253950).

Almost surely, 2^21105072712 is an apocalyptic number.

It is an amenable number.

21105072712 is a deficient number, since it is larger than the sum of its proper divisors (19895053688).

21105072712 is a wasteful number, since it uses less digits than its factorization.

21105072712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141285 (or 141281 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 28.

The spelling of 21105072712 in words is "twenty-one billion, one hundred five million, seventy-two thousand, seven hundred twelve".