21220131320 has 32 divisors (see below), whose sum is σ = 47753258400. Its totient is φ = 8486636928.

The previous prime is 21220131313. The next prime is 21220131347. The reversal of 21220131320 is 2313102212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217757 + ... + 299763.

It is an arithmetic number, because the mean of its divisors is an integer number (1492289325).

Almost surely, 2^21220131320 is an apocalyptic number.

21220131320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220131320 is an abundant number, since it is smaller than the sum of its proper divisors (26533127080).

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

21220131320 is a wasteful number, since it uses less digits than its factorization.

21220131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88487 (or 88483 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220131320 its reverse (2313102212), we get a palindrome (23533233532).

The spelling of 21220131320 in words is "twenty-one billion, two hundred twenty million, one hundred thirty-one thousand, three hundred twenty".