21131233223100 has 432 divisors, whose sum is σ = 82711573453824. Its totient is φ = 4053143001600.

The previous prime is 21131233223083. The next prime is 21131233223123. The reversal of 21131233223100 is 132233213112.

It is a super-2 number, since 2×21131233223100² (a number of 27 digits) contains 22 as substring.

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, 104797 + ... + 6501803.

Almost surely, 2^{21131233223100} is an apocalyptic number.

21131233223100 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 21131233223100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41355786726912).

21131233223100 is an abundant number, since it is smaller than the sum of its proper divisors (61580340230724).

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

21131233223100 is a wasteful number, since it uses less digits than its factorization.

21131233223100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6397066 (or 6397048 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21131233223100 its reverse (132233213112), we get a palindrome (21263466436212).

The spelling of 21131233223100 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred thirty-three million, two hundred twenty-three thousand, one hundred".