21753540810 has 48 divisors (see below), whose sum is σ = 56573876736. Its totient is φ = 5799439584.

The previous prime is 21753540793. The next prime is 21753540811. The reversal of 21753540810 is 1804535712.

21753540810 is a `hidden beast` number, since 2 + 1 + 7 + 535 + 40 + 81 + 0 = 666.

It is a super-2 number, since 2×21753540810² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21753540811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342147 + ... + 400713.

It is an arithmetic number, because the mean of its divisors is an integer number (1178622432).

Almost surely, 2^21753540810 is an apocalyptic number.

21753540810 is an abundant number, since it is smaller than the sum of its proper divisors (34820335926).

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

21753540810 is a wasteful number, since it uses less digits than its factorization.

21753540810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62707 (or 62704 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 21753540810 in words is "twenty-one billion, seven hundred fifty-three million, five hundred forty thousand, eight hundred ten".