21113500201000 has 64 divisors (see below), whose sum is σ = 49720276129680. Its totient is φ = 8391607660800.

The previous prime is 21113500200967. The next prime is 21113500201061. The reversal of 21113500201000 is 10200531112.

It can be written as a sum of positive squares in 8 ways, for example, as 3048467112196 + 18065033088804 = 1745986^2 + 4250298^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67083447 + ... + 67397446.

Almost surely, 2^{21113500201000} is an apocalyptic number.

21113500201000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113500201000 is an abundant number, since it is smaller than the sum of its proper divisors (28606775928680).

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

21113500201000 is a wasteful number, since it uses less digits than its factorization.

21113500201000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134481071 (or 134481057 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21113500201000 its reverse (10200531112), we get a palindrome (21123700732112).

The spelling of 21113500201000 in words is "twenty-one trillion, one hundred thirteen billion, five hundred million, two hundred one thousand".