21154326320 has 20 divisors (see below), whose sum is σ = 49183808880. Its totient is φ = 8461730496.

The previous prime is 21154326301. The next prime is 21154326353. The reversal of 21154326320 is 2362345112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132214460 + ... + 132214619.

It is an arithmetic number, because the mean of its divisors is an integer number (2459190444).

Almost surely, 2^21154326320 is an apocalyptic number.

21154326320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21154326320 is an abundant number, since it is smaller than the sum of its proper divisors (28029482560).

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

21154326320 is a wasteful number, since it uses less digits than its factorization.

21154326320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264429092 (or 264429086 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21154326320 in words is "twenty-one billion, one hundred fifty-four million, three hundred twenty-six thousand, three hundred twenty".