21631154376 has 32 divisors (see below), whose sum is σ = 58237724160. Its totient is φ = 6655739712.

The previous prime is 21631154339. The next prime is 21631154381. The reversal of 21631154376 is 67345113612.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34665000 + ... + 34665623.

It is an arithmetic number, because the mean of its divisors is an integer number (1819928880).

Almost surely, 2^21631154376 is an apocalyptic number.

21631154376 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21631154376 is an abundant number, since it is smaller than the sum of its proper divisors (36606569784).

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

21631154376 is a wasteful number, since it uses less digits than its factorization.

21631154376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69330645 (or 69330641 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

Adding to 21631154376 its reverse (67345113612), we get a palindrome (88976267988).

The spelling of 21631154376 in words is "twenty-one billion, six hundred thirty-one million, one hundred fifty-four thousand, three hundred seventy-six".