21302311220 has 24 divisors (see below), whose sum is σ = 44747128608. Its totient is φ = 8518586400.

The previous prime is 21302311213. The next prime is 21302311229. The reversal of 21302311220 is 2211320312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302311229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70466 + ... + 218105.

It is an arithmetic number, because the mean of its divisors is an integer number (1864463692).

Almost surely, 2^21302311220 is an apocalyptic number.

21302311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302311220 is an abundant number, since it is smaller than the sum of its proper divisors (23444817388).

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

21302311220 is a wasteful number, since it uses less digits than its factorization.

21302311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292271 (or 292269 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21302311220 its reverse (2211320312), we get a palindrome (23513631532).

The spelling of 21302311220 in words is "twenty-one billion, three hundred two million, three hundred eleven thousand, two hundred twenty".