21202131200 has 54 divisors (see below), whose sum is σ = 52478603394. Its totient is φ = 8480849920.

The previous prime is 21202131199. The next prime is 21202131211. The reversal of 21202131200 is 213120212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 184090624 + 21018040576 = 13568^2 + 144976^2 .

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 5 ways as a sum of consecutive naturals, for example, 1650017 + ... + 1662816.

Almost surely, 2^21202131200 is an apocalyptic number.

21202131200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202131200 is an abundant number, since it is smaller than the sum of its proper divisors (31276472194).

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

21202131200 is an equidigital number, since it uses as much as digits as its factorization.

21202131200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312859 (or 3312840 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21202131200 its reverse (213120212), we get a palindrome (21415251412).

The spelling of 21202131200 in words is "twenty-one billion, two hundred two million, one hundred thirty-one thousand, two hundred".