21222020020 has 24 divisors (see below), whose sum is σ = 44572500000. Its totient is φ = 8487616032.

The previous prime is 21222020011. The next prime is 21222020063. The reversal of 21222020020 is 2002022212.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 79231 + ... + 220729.

It is an arithmetic number, because the mean of its divisors is an integer number (1857187500).

Almost surely, 2^21222020020 is an apocalyptic number.

21222020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222020020 is an abundant number, since it is smaller than the sum of its proper divisors (23350479980).

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

21222020020 is a wasteful number, since it uses less digits than its factorization.

21222020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149007 (or 149005 counting only the distinct ones).

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

Adding to 21222020020 its reverse (2002022212), we get a palindrome (23224042232).

The spelling of 21222020020 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, twenty".