21110212100 has 18 divisors (see below), whose sum is σ = 45809160474. Its totient is φ = 8444084800.

The previous prime is 21110212099. The next prime is 21110212127. The reversal of 21110212100 is 121201112.

It can be written as a sum of positive squares in 3 ways, for example, as 272712196 + 20837499904 = 16514^2 + 144352^2 .

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, 105550961 + ... + 105551160.

Almost surely, 2^21110212100 is an apocalyptic number.

21110212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110212100 is an abundant number, since it is smaller than the sum of its proper divisors (24698948374).

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

21110212100 is a wasteful number, since it uses less digits than its factorization.

21110212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211102135 (or 211102128 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21110212100 its reverse (121201112), we get a palindrome (21231413212).

The spelling of 21110212100 in words is "twenty-one billion, one hundred ten million, two hundred twelve thousand, one hundred".