21302210220 has 24 divisors (see below), whose sum is σ = 59646188784. Its totient is φ = 5680589376.

The previous prime is 21302210161. The next prime is 21302210231. The reversal of 21302210220 is 2201220312.

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 21302210220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177518359 + ... + 177518478.

It is an arithmetic number, because the mean of its divisors is an integer number (2485257866).

Almost surely, 2^21302210220 is an apocalyptic number.

21302210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302210220 is an abundant number, since it is smaller than the sum of its proper divisors (38343978564).

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

21302210220 is a wasteful number, since it uses less digits than its factorization.

21302210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355036849 (or 355036847 counting only the distinct ones).

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

Adding to 21302210220 its reverse (2201220312), we get a palindrome (23503430532).

The spelling of 21302210220 in words is "twenty-one billion, three hundred two million, two hundred ten thousand, two hundred twenty".