21313222020 has 36 divisors (see below), whose sum is σ = 64650107340. Its totient is φ = 5683525824.

The previous prime is 21313222019. The next prime is 21313222043. The reversal of 21313222020 is 2022231312.

It can be written as a sum of positive squares in 2 ways, for example, as 6071838084 + 15241383936 = 77922^2 + 123456^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 21313221984 and 21313222002.

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, 59203215 + ... + 59203574.

It is an arithmetic number, because the mean of its divisors is an integer number (1795836315).

Almost surely, 2^21313222020 is an apocalyptic number.

21313222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313222020 is an abundant number, since it is smaller than the sum of its proper divisors (43336885320).

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

21313222020 is a wasteful number, since it uses less digits than its factorization.

21313222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118406804 (or 118406799 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21313222020 its reverse (2022231312), we get a palindrome (23335453332).

The spelling of 21313222020 in words is "twenty-one billion, three hundred thirteen million, two hundred twenty-two thousand, twenty".