21101011022100 has 72 divisors (see below), whose sum is σ = 61052975915008. Its totient is φ = 5626870156800.

The previous prime is 21101011022099. The next prime is 21101011022171. The reversal of 21101011022100 is 122011010112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28536045 + ... + 29266155.

Almost surely, 2^{21101011022100} is an apocalyptic number.

21101011022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101011022100 is an abundant number, since it is smaller than the sum of its proper divisors (39951964892908).

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

21101011022100 is a wasteful number, since it uses less digits than its factorization.

21101011022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826465 (or 826458 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101011022100 its reverse (122011010112), we get a palindrome (21223022032212).

The spelling of 21101011022100 in words is "twenty-one trillion, one hundred one billion, eleven million, twenty-two thousand, one hundred".