21222365420 has 48 divisors (see below), whose sum is σ = 46527445440. Its totient is φ = 8115883776.

The previous prime is 21222365407. The next prime is 21222365447. The reversal of 21222365420 is 2456322212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1033574 + ... + 1053906.

It is an arithmetic number, because the mean of its divisors is an integer number (969321780).

Almost surely, 2^21222365420 is an apocalyptic number.

21222365420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222365420 is an abundant number, since it is smaller than the sum of its proper divisors (25305080020).

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

21222365420 is a wasteful number, since it uses less digits than its factorization.

21222365420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22634 (or 22632 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21222365420 its reverse (2456322212), we get a palindrome (23678687632).

The spelling of 21222365420 in words is "twenty-one billion, two hundred twenty-two million, three hundred sixty-five thousand, four hundred twenty".