21111315305344 has 64 divisors (see below), whose sum is σ = 48295921737600. Its totient is φ = 9090997009920.

The previous prime is 21111315305299. The next prime is 21111315305357. The reversal of 21111315305344 is 44350351311112.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394547772 + ... + 394601275.

It is an arithmetic number, because the mean of its divisors is an integer number (754623777150).

Almost surely, 2^{21111315305344} is an apocalyptic number.

It is an amenable number.

21111315305344 is an abundant number, since it is smaller than the sum of its proper divisors (27184606432256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111315305344 is a wasteful number, since it uses less digits than its factorization.

21111315305344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789149091 (or 789149079 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 21111315305344 its reverse (44350351311112), we get a palindrome (65461666616456).

The spelling of 21111315305344 in words is "twenty-one trillion, one hundred eleven billion, three hundred fifteen million, three hundred five thousand, three hundred forty-four".