21320210220 has 48 divisors (see below), whose sum is σ = 59711447040. Its totient is φ = 5683974336.

The previous prime is 21320210209. The next prime is 21320210257. The reversal of 21320210220 is 2201202312.

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 21320210220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211029 + ... + 295251.

It is an arithmetic number, because the mean of its divisors is an integer number (1243988480).

Almost surely, 2^21320210220 is an apocalyptic number.

21320210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320210220 is an abundant number, since it is smaller than the sum of its proper divisors (38391236820).

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

21320210220 is a wasteful number, since it uses less digits than its factorization.

21320210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88454 (or 88452 counting only the distinct ones).

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

Adding to 21320210220 its reverse (2201202312), we get a palindrome (23521412532).

It can be divided in two parts, 21320 and 210220, that added together give a triangular number (231540 = T₆₈₀).

The spelling of 21320210220 in words is "twenty-one billion, three hundred twenty million, two hundred ten thousand, two hundred twenty".