21313022220 has 144 divisors (see below), whose sum is σ = 77097646080. Its totient is φ = 4659735168.

The previous prime is 21313022207. The next prime is 21313022221. The reversal of 21313022220 is 2222031312.

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 = 21313022193 and 21313022202.

It is not an unprimeable number, because it can be changed into a prime (21313022221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338740 + ... + 396699.

It is an arithmetic number, because the mean of its divisors is an integer number (535400320).

Almost surely, 2^21313022220 is an apocalyptic number.

21313022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313022220 is an abundant number, since it is smaller than the sum of its proper divisors (55784623860).

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

21313022220 is a wasteful number, since it uses less digits than its factorization.

21313022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735484 (or 735479 counting only the distinct ones).

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

Adding to 21313022220 its reverse (2222031312), we get a palindrome (23535053532).

The spelling of 21313022220 in words is "twenty-one billion, three hundred thirteen million, twenty-two thousand, two hundred twenty".