21012002131100 has 18 divisors (see below), whose sum is σ = 45596044624704. Its totient is φ = 8404800852400.

The previous prime is 21012002131079. The next prime is 21012002131111. The reversal of 21012002131100 is 113120021012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105060010556 + ... + 105060010755.

Almost surely, 2^{21012002131100} is an apocalyptic number.

21012002131100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012002131100 is an abundant number, since it is smaller than the sum of its proper divisors (24584042493604).

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

21012002131100 is a wasteful number, since it uses less digits than its factorization.

21012002131100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210120021325 (or 210120021318 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21012002131100 its reverse (113120021012), we get a palindrome (21125122152112).

The spelling of 21012002131100 in words is "twenty-one trillion, twelve billion, two million, one hundred thirty-one thousand, one hundred".