21231300122100 has 432 divisors, whose sum is σ = 70253089181184. Its totient is φ = 5356108800000.

The previous prime is 21231300121979. The next prime is 21231300122141. The reversal of 21231300122100 is 122100313212.

21231300122100 is a `hidden beast` number, since 2 + 1 + 231 + 300 + 122 + 10 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 230100975 + ... + 230193225.

Almost surely, 2^{21231300122100} is an apocalyptic number.

21231300122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231300122100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35126544590592).

21231300122100 is an abundant number, since it is smaller than the sum of its proper divisors (49021789059084).

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

21231300122100 is a wasteful number, since it uses less digits than its factorization.

21231300122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92488 (or 92478 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21231300122100 its reverse (122100313212), we get a palindrome (21353400435312).

The spelling of 21231300122100 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred million, one hundred twenty-two thousand, one hundred".