21311454400 has 84 divisors (see below), whose sum is σ = 53555420448. Its totient is φ = 8343178240.

The previous prime is 21311454377. The next prime is 21311454421. The reversal of 21311454400 is 445411312.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66499 + ... + 216898.

Almost surely, 2^21311454400 is an apocalyptic number.

21311454400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311454400 is an abundant number, since it is smaller than the sum of its proper divisors (32243966048).

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

21311454400 is a wasteful number, since it uses less digits than its factorization.

21311454400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283466 (or 283451 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21311454400 its reverse (445411312), we get a palindrome (21756865712).

The spelling of 21311454400 in words is "twenty-one billion, three hundred eleven million, four hundred fifty-four thousand, four hundred".