21022130320 has 40 divisors (see below), whose sum is σ = 48895799040. Its totient is φ = 8405523840.

The previous prime is 21022130267. The next prime is 21022130323. The reversal of 21022130320 is 2303122012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21022130294 and 21022130303.

It is not an unprimeable number, because it can be changed into a prime (21022130323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156571 + ... + 257989.

It is an arithmetic number, because the mean of its divisors is an integer number (1222394976).

Almost surely, 2^21022130320 is an apocalyptic number.

21022130320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022130320 is an abundant number, since it is smaller than the sum of its proper divisors (27873668720).

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

21022130320 is a wasteful number, since it uses less digits than its factorization.

21022130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104023 (or 104017 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21022130320 its reverse (2303122012), we get a palindrome (23325252332).

The spelling of 21022130320 in words is "twenty-one billion, twenty-two million, one hundred thirty thousand, three hundred twenty".