21203313131100 has 36 divisors (see below), whose sum is σ = 61348252660184. Its totient is φ = 5654216834880.

The previous prime is 21203313131027. The next prime is 21203313131141. The reversal of 21203313131100 is 113131330212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35338854919 + ... + 35338855518.

Almost surely, 2^{21203313131100} is an apocalyptic number.

21203313131100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203313131100 is an abundant number, since it is smaller than the sum of its proper divisors (40144939529084).

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

21203313131100 is a wasteful number, since it uses less digits than its factorization.

21203313131100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70677710454 (or 70677710447 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 21203313131100 its reverse (113131330212), we get a palindrome (21316444461312).

The spelling of 21203313131100 in words is "twenty-one trillion, two hundred three billion, three hundred thirteen million, one hundred thirty-one thousand, one hundred".