21645444454612 has 48 divisors (see below), whose sum is σ = 41346630807552. Its totient is φ = 9833242554080.

The previous prime is 21645444454519. The next prime is 21645444454637.

21645444454612 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21645444454612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 629815053 + ... + 629849419.

It is an arithmetic number, because the mean of its divisors is an integer number (861388141824).

Almost surely, 2^{21645444454612} is an apocalyptic number.

21645444454612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21645444454612 is a deficient number, since it is larger than the sum of its proper divisors (19701186352940).

21645444454612 is a wasteful number, since it uses less digits than its factorization.

21645444454612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42108 (or 42106 counting only the distinct ones).

The product of its digits is 14745600, while the sum is 52.

The spelling of 21645444454612 in words is "twenty-one trillion, six hundred forty-five billion, four hundred forty-four million, four hundred fifty-four thousand, six hundred twelve".