21831154560 has 128 divisors (see below), whose sum is σ = 77318733600. Its totient is φ = 5821636608.

The previous prime is 21831154547. The next prime is 21831154601. The reversal of 21831154560 is 6545113812.

21831154560 is a `hidden beast` number, since 2 + 1 + 83 + 1 + 15 + 4 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 614409 + ... + 648968.

Almost surely, 2^21831154560 is an apocalyptic number.

21831154560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21831154560 is an abundant number, since it is smaller than the sum of its proper divisors (55487579040).

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

21831154560 is a wasteful number, since it uses less digits than its factorization.

21831154560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263405 (or 1263387 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 21831154560 in words is "twenty-one billion, eight hundred thirty-one million, one hundred fifty-four thousand, five hundred sixty".