21130431400 has 48 divisors (see below), whose sum is σ = 52907355900. Its totient is φ = 7802004480.

The previous prime is 21130431397. The next prime is 21130431419. The reversal of 21130431400 is 413403112.

It can be written as a sum of positive squares in 6 ways, for example, as 3067608996 + 18062822404 = 55386^2 + 134398^2 .

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 11 ways as a sum of consecutive naturals, for example, 4060945 + ... + 4066144.

Almost surely, 2^21130431400 is an apocalyptic number.

21130431400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130431400 is an abundant number, since it is smaller than the sum of its proper divisors (31776924500).

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

21130431400 is a wasteful number, since it uses less digits than its factorization.

21130431400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8127118 (or 8127109 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21130431400 its reverse (413403112), we get a palindrome (21543834512).

The spelling of 21130431400 in words is "twenty-one billion, one hundred thirty million, four hundred thirty-one thousand, four hundred".