21222131320 has 64 divisors (see below), whose sum is σ = 54129348000. Its totient is φ = 7423446528.

The previous prime is 21222131219. The next prime is 21222131321. The reversal of 21222131320 is 2313122212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222131321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064115 + ... + 1083874.

Almost surely, 2^21222131320 is an apocalyptic number.

21222131320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222131320 is an abundant number, since it is smaller than the sum of its proper divisors (32907216680).

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

21222131320 is a wasteful number, since it uses less digits than its factorization.

21222131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148032 (or 2148028 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21222131320 its reverse (2313122212), we get a palindrome (23535253532).

The spelling of 21222131320 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, three hundred twenty".