21222002020 has 48 divisors (see below), whose sum is σ = 49239404928. Its totient is φ = 7642088960.

The previous prime is 21222001981. The next prime is 21222002047. The reversal of 21222002020 is 2020022212.

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 15 ways as a sum of consecutive naturals, for example, 1349086 + ... + 1364725.

It is an arithmetic number, because the mean of its divisors is an integer number (1025820936).

Almost surely, 2^21222002020 is an apocalyptic number.

21222002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222002020 is an abundant number, since it is smaller than the sum of its proper divisors (28017402908).

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

21222002020 is a wasteful number, since it uses less digits than its factorization.

21222002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713860 (or 2713858 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21222002020 its reverse (2020022212), we get a palindrome (23242024232).

The spelling of 21222002020 in words is "twenty-one billion, two hundred twenty-two million, two thousand, twenty".