21021231123100 has 72 divisors (see below), whose sum is σ = 49173212244240. Its totient is φ = 7754067886080.

The previous prime is 21021231123091. The next prime is 21021231123103. The reversal of 21021231123100 is 132113212012.

It is a super-2 number, since 2×21021231123100² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021231123103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6609637 + ... + 9259036.

It is an arithmetic number, because the mean of its divisors is an integer number (682961281170).

Almost surely, 2^{21021231123100} is an apocalyptic number.

21021231123100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021231123100 is an abundant number, since it is smaller than the sum of its proper divisors (28151981121140).

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

21021231123100 is a wasteful number, since it uses less digits than its factorization.

21021231123100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15869719 (or 15869712 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21021231123100 its reverse (132113212012), we get a palindrome (21153344335112).

It can be divided in two parts, 2102123 and 1123100, that added together give a palindrome (3225223).

The spelling of 21021231123100 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-one million, one hundred twenty-three thousand, one hundred".