21266331400 has 48 divisors (see below), whose sum is σ = 52046557200. Its totient is φ = 8058818880.

The previous prime is 21266331389. The next prime is 21266331431. The reversal of 21266331400 is 413366212.

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, 2794402 + ... + 2802001.

It is an arithmetic number, because the mean of its divisors is an integer number (1084303275).

Almost surely, 2^21266331400 is an apocalyptic number.

21266331400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21266331400 is an abundant number, since it is smaller than the sum of its proper divisors (30780225800).

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

21266331400 is a wasteful number, since it uses less digits than its factorization.

21266331400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596438 (or 5596429 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21266331400 its reverse (413366212), we get a palindrome (21679697612).

The spelling of 21266331400 in words is "twenty-one billion, two hundred sixty-six million, three hundred thirty-one thousand, four hundred".