21012112210100 has 36 divisors (see below), whose sum is σ = 49741400179968. Its totient is φ = 7640768076000.

The previous prime is 21012112210073. The next prime is 21012112210123. The reversal of 21012112210100 is 101221121012.

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, 9550958996 + ... + 9550961195.

Almost surely, 2^{21012112210100} is an apocalyptic number.

21012112210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012112210100 is an abundant number, since it is smaller than the sum of its proper divisors (28729287969868).

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

21012112210100 is a wasteful number, since it uses less digits than its factorization.

21012112210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19101920216 (or 19101920209 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012112210100 its reverse (101221121012), we get a palindrome (21113333331112).

It can be divided in two parts, 21012112 and 210100, that added together give a palindrome (21222212).

The spelling of 21012112210100 in words is "twenty-one trillion, twelve billion, one hundred twelve million, two hundred ten thousand, one hundred".