21931832836 has 9 divisors (see below), whose sum is σ = 38381225799. Its totient is φ = 10965768324.

The previous prime is 21931832809. The next prime is 21931832861. The reversal of 21931832836 is 63823813912.

The square root of 21931832836 is 148094.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 259165 + ... + 333211.

Almost surely, 2^21931832836 is an apocalyptic number.

21931832836 is the 148094-th square number.

It is an amenable number.

21931832836 is a deficient number, since it is larger than the sum of its proper divisors (16449392963).

21931832836 is an frugal number, since it uses more digits than its factorization.

21931832836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148098 (or 74049 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The spelling of 21931832836 in words is "twenty-one billion, nine hundred thirty-one million, eight hundred thirty-two thousand, eight hundred thirty-six".