21058105724 has 12 divisors (see below), whose sum is σ = 36977460744. Its totient is φ = 10493116944.

The previous prime is 21058105721. The next prime is 21058105729. The reversal of 21058105724 is 42750185012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21058105721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8982662 + ... + 8985005.

It is an arithmetic number, because the mean of its divisors is an integer number (3081455062).

Almost surely, 2^21058105724 is an apocalyptic number.

It is an amenable number.

21058105724 is a deficient number, since it is larger than the sum of its proper divisors (15919355020).

21058105724 is a wasteful number, since it uses less digits than its factorization.

21058105724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17967964 (or 17967962 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 21058105724 in words is "twenty-one billion, fifty-eight million, one hundred five thousand, seven hundred twenty-four".