21331311300 has 108 divisors (see below), whose sum is σ = 72005065860. Its totient is φ = 5250781440.

The previous prime is 21331311283. The next prime is 21331311307. The reversal of 21331311300 is 311313312.

It is a happy number.

21331311300 is a `hidden beast` number, since 2 + 1 + 331 + 31 + 1 + 300 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 295289856 + 21036021444 = 17184^2 + 145038^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21331311307) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 899895 + ... + 923294.

Almost surely, 2^21331311300 is an apocalyptic number.

21331311300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331311300 is an abundant number, since it is smaller than the sum of its proper divisors (50673754560).

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

21331311300 is a wasteful number, since it uses less digits than its factorization.

21331311300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823222 (or 1823212 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21331311300 its reverse (311313312), we get a palindrome (21642624612).

The spelling of 21331311300 in words is "twenty-one billion, three hundred thirty-one million, three hundred eleven thousand, three hundred".