21755323530 has 96 divisors (see below), whose sum is σ = 60402101760. Its totient is φ = 5420661120.

The previous prime is 21755323489. The next prime is 21755323537. The reversal of 21755323530 is 3532355712.

21755323530 is a `hidden beast` number, since 2 + 1 + 75 + 53 + 2 + 3 + 530 = 666.

It is not an unprimeable number, because it can be changed into a prime (21755323537) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53532 + ... + 215351.

It is an arithmetic number, because the mean of its divisors is an integer number (629188560).

Almost surely, 2^21755323530 is an apocalyptic number.

21755323530 is an abundant number, since it is smaller than the sum of its proper divisors (38646778230).

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

21755323530 is a wasteful number, since it uses less digits than its factorization.

21755323530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268956 (or 268953 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 36.

The spelling of 21755323530 in words is "twenty-one billion, seven hundred fifty-five million, three hundred twenty-three thousand, five hundred thirty".