21489363831 has 48 divisors (see below), whose sum is σ = 33107481600. Its totient is φ = 12356188416.

The previous prime is 21489363823. The next prime is 21489363881. The reversal of 21489363831 is 13836398412.

It is not a de Polignac number, because 21489363831 - 2³ = 21489363823 is a prime.

It is a super-2 number, since 2×21489363831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489363811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 687930 + ... + 718488.

It is an arithmetic number, because the mean of its divisors is an integer number (689739200).

Almost surely, 2^21489363831 is an apocalyptic number.

21489363831 is a deficient number, since it is larger than the sum of its proper divisors (11618117769).

21489363831 is a wasteful number, since it uses less digits than its factorization.

21489363831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30680 (or 30667 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The spelling of 21489363831 in words is "twenty-one billion, four hundred eighty-nine million, three hundred sixty-three thousand, eight hundred thirty-one".