21267831836 has 12 divisors (see below), whose sum is σ = 37296409920. Its totient is φ = 10611714720.

The previous prime is 21267831833. The next prime is 21267831853. The reversal of 21267831836 is 63813876212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267831833) 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, 5548145 + ... + 5551976.

It is an arithmetic number, because the mean of its divisors is an integer number (3108034160).

Almost surely, 2^21267831836 is an apocalyptic number.

It is an amenable number.

21267831836 is a deficient number, since it is larger than the sum of its proper divisors (16028578084).

21267831836 is a wasteful number, since it uses less digits than its factorization.

21267831836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100604 (or 11100602 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The spelling of 21267831836 in words is "twenty-one billion, two hundred sixty-seven million, eight hundred thirty-one thousand, eight hundred thirty-six".