21160051724 has 48 divisors (see below), whose sum is σ = 44333721600. Its totient is φ = 8645023296.

The previous prime is 21160051721. The next prime is 21160051733. The reversal of 21160051724 is 42715006112.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (21160051721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100784 + ... + 229079.

It is an arithmetic number, because the mean of its divisors is an integer number (923619200).

Almost surely, 2^21160051724 is an apocalyptic number.

It is an amenable number.

21160051724 is an abundant number, since it is smaller than the sum of its proper divisors (23173669876).

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

21160051724 is a wasteful number, since it uses less digits than its factorization.

21160051724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329982 (or 329980 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 21160051724 its reverse (42715006112), we get a palindrome (63875057836).

The spelling of 21160051724 in words is "twenty-one billion, one hundred sixty million, fifty-one thousand, seven hundred twenty-four".