21223131120 has 60 divisors (see below), whose sum is σ = 71274351096. Its totient is φ = 5659501440.

The previous prime is 21223131089. The next prime is 21223131187. The reversal of 21223131120 is 2113132212.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a junction number, because it is equal to n+sod(n) for n = 21223131093 and 21223131102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14737566 + ... + 14739005.

Almost surely, 2^21223131120 is an apocalyptic number.

21223131120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223131120 is an abundant number, since it is smaller than the sum of its proper divisors (50051219976).

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

21223131120 is a wasteful number, since it uses less digits than its factorization.

21223131120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29476590 (or 29476581 counting only the distinct ones).

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

Adding to 21223131120 its reverse (2113132212), we get a palindrome (23336263332).

The spelling of 21223131120 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, one hundred twenty".