21369735144 has 64 divisors (see below), whose sum is σ = 59905032000. Its totient is φ = 7057886400.

The previous prime is 21369735139. The next prime is 21369735169. The reversal of 21369735144 is 44153796312.

21369735144 is a `hidden beast` number, since 2 + 1 + 3 + 69 + 73 + 514 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21369735144.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430282 + ... + 477369.

It is an arithmetic number, because the mean of its divisors is an integer number (936016125).

Almost surely, 2^21369735144 is an apocalyptic number.

21369735144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21369735144 is an abundant number, since it is smaller than the sum of its proper divisors (38535296856).

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

21369735144 is a wasteful number, since it uses less digits than its factorization.

21369735144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907775 (or 907765 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 21369735144 in words is "twenty-one billion, three hundred sixty-nine million, seven hundred thirty-five thousand, one hundred forty-four".