21105700312444 has 24 divisors (see below), whose sum is σ = 40309927257600. Its totient is φ = 9589398556080.

The previous prime is 21105700312441. The next prime is 21105700312469. The reversal of 21105700312444 is 44421300750112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105700312441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102435564 + ... + 102641395.

It is an arithmetic number, because the mean of its divisors is an integer number (1679580302400).

Almost surely, 2^{21105700312444} is an apocalyptic number.

It is an amenable number.

21105700312444 is a deficient number, since it is larger than the sum of its proper divisors (19204226945156).

21105700312444 is a wasteful number, since it uses less digits than its factorization.

21105700312444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205079313 (or 205079311 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 21105700312444 in words is "twenty-one trillion, one hundred five billion, seven hundred million, three hundred twelve thousand, four hundred forty-four".