21231363760 has 40 divisors (see below), whose sum is σ = 49987782720. Its totient is φ = 8385042432.

The previous prime is 21231363737. The next prime is 21231363851. The reversal of 21231363760 is 6736313212.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1673377 + ... + 1686016.

It is an arithmetic number, because the mean of its divisors is an integer number (1249694568).

Almost surely, 2^21231363760 is an apocalyptic number.

21231363760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231363760 is an abundant number, since it is smaller than the sum of its proper divisors (28756418960).

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

21231363760 is a wasteful number, since it uses less digits than its factorization.

21231363760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3359485 (or 3359479 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 34.

Adding to 21231363760 its reverse (6736313212), we get a palindrome (27967676972).

The spelling of 21231363760 in words is "twenty-one billion, two hundred thirty-one million, three hundred sixty-three thousand, seven hundred sixty".