21131102022100 has 72 divisors (see below), whose sum is σ = 55487787929280. Its totient is φ = 6818775774720.

The previous prime is 21131102022077. The next prime is 21131102022113. The reversal of 21131102022100 is 122020113112.

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, 887849530 + ... + 887873329.

It is an arithmetic number, because the mean of its divisors is an integer number (770663721240).

Almost surely, 2^{21131102022100} is an apocalyptic number.

21131102022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131102022100 is an abundant number, since it is smaller than the sum of its proper divisors (34356685907180).

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

21131102022100 is a wasteful number, since it uses less digits than its factorization.

21131102022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775722897 (or 1775722890 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21131102022100 its reverse (122020113112), we get a palindrome (21253122135212).

The spelling of 21131102022100 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred two million, twenty-two thousand, one hundred".