21160135544 has 16 divisors (see below), whose sum is σ = 39880828320. Its totient is φ = 10525248000.

The previous prime is 21160135523. The next prime is 21160135613. The reversal of 21160135544 is 44553106112.

It is a self number, because there is not a number n which added to its sum of digits gives 21160135544.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6850832 + ... + 6853919.

It is an arithmetic number, because the mean of its divisors is an integer number (2492551770).

Almost surely, 2^21160135544 is an apocalyptic number.

It is an amenable number.

21160135544 is a deficient number, since it is larger than the sum of its proper divisors (18720692776).

21160135544 is a wasteful number, since it uses less digits than its factorization.

21160135544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13704950 (or 13704946 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 21160135544 in words is "twenty-one billion, one hundred sixty million, one hundred thirty-five thousand, five hundred forty-four".