21011120212100 has 18 divisors (see below), whose sum is σ = 45594130860474. Its totient is φ = 8404448084800.

The previous prime is 21011120212051. The next prime is 21011120212133. The reversal of 21011120212100 is 121202111012.

It can be written as a sum of positive squares in 3 ways, for example, as 1299527041024 + 19711593171076 = 1139968^2 + 4439774^2 .

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, 105055600961 + ... + 105055601160.

Almost surely, 2^{21011120212100} is an apocalyptic number.

21011120212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011120212100 is an abundant number, since it is smaller than the sum of its proper divisors (24583010648374).

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

21011120212100 is a wasteful number, since it uses less digits than its factorization.

21011120212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210111202135 (or 210111202128 counting only the distinct ones).

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

Adding to 21011120212100 its reverse (121202111012), we get a palindrome (21132322323112).

The spelling of 21011120212100 in words is "twenty-one trillion, eleven billion, one hundred twenty million, two hundred twelve thousand, one hundred".