21202310220 has 96 divisors (see below), whose sum is σ = 73066441728. Its totient is φ = 4473453312.

The previous prime is 21202310219. The next prime is 21202310267. The reversal of 21202310220 is 2201320212.

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 21202310220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1936144 + ... + 1947063.

It is an arithmetic number, because the mean of its divisors is an integer number (761108768).

Almost surely, 2^21202310220 is an apocalyptic number.

21202310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202310220 is an abundant number, since it is smaller than the sum of its proper divisors (51864131508).

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

21202310220 is a wasteful number, since it uses less digits than its factorization.

21202310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3883239 (or 3883237 counting only the distinct ones).

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

Adding to 21202310220 its reverse (2201320212), we get a palindrome (23403630432).

The spelling of 21202310220 in words is "twenty-one billion, two hundred two million, three hundred ten thousand, two hundred twenty".