22000021220 has 24 divisors (see below), whose sum is σ = 47071745784. Its totient is φ = 8633970176.

The previous prime is 22000021129. The next prime is 22000021231. The reversal of 22000021220 is 2212000022.

It can be written as a sum of positive squares in 4 ways, for example, as 7095029824 + 14904991396 = 84232^2 + 122086^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10376309 + ... + 10378428.

It is an arithmetic number, because the mean of its divisors is an integer number (1961322741).

Almost surely, 2^22000021220 is an apocalyptic number.

22000021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22000021220 is an abundant number, since it is smaller than the sum of its proper divisors (25071724564).

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

22000021220 is a wasteful number, since it uses less digits than its factorization.

22000021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20754799 (or 20754797 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 22000021220 its reverse (2212000022), we get a palindrome (24212021242).

The spelling of 22000021220 in words is "twenty-two billion, twenty-one thousand, two hundred twenty".