21310022220 has 48 divisors (see below), whose sum is σ = 59678367840. Its totient is φ = 5681691136.

The previous prime is 21310022213. The next prime is 21310022221. The reversal of 21310022220 is 2222001312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21310022220.

It is not an unprimeable number, because it can be changed into a prime (21310022221) 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, 360946 + ... + 415814.

It is an arithmetic number, because the mean of its divisors is an integer number (1243299330).

Almost surely, 2^21310022220 is an apocalyptic number.

21310022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310022220 is an abundant number, since it is smaller than the sum of its proper divisors (38368345620).

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

21310022220 is a wasteful number, since it uses less digits than its factorization.

21310022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61354 (or 61352 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21310022220 its reverse (2222001312), we get a palindrome (23532023532).

The spelling of 21310022220 in words is "twenty-one billion, three hundred ten million, twenty-two thousand, two hundred twenty".