21150545724 has 72 divisors (see below), whose sum is σ = 66656274048. Its totient is φ = 5493647520.

The previous prime is 21150545707. The next prime is 21150545737. The reversal of 21150545724 is 42754505112.

21150545724 is a `hidden beast` number, since 21 + 15 + 0 + 54 + 572 + 4 = 666.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3812262 + ... + 3817805.

It is an arithmetic number, because the mean of its divisors is an integer number (925781584).

Almost surely, 2^21150545724 is an apocalyptic number.

It is an amenable number.

21150545724 is an abundant number, since it is smaller than the sum of its proper divisors (45505728324).

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

21150545724 is a wasteful number, since it uses less digits than its factorization.

21150545724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630095 (or 7630090 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The spelling of 21150545724 in words is "twenty-one billion, one hundred fifty million, five hundred forty-five thousand, seven hundred twenty-four".