21022222220 has 12 divisors (see below), whose sum is σ = 44146666704. Its totient is φ = 8408888880.

The previous prime is 21022222217. The next prime is 21022222261. The reversal of 21022222220 is 2222222012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525555536 + ... + 525555575.

It is an arithmetic number, because the mean of its divisors is an integer number (3678888892).

Almost surely, 2^21022222220 is an apocalyptic number.

21022222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022222220 is an abundant number, since it is smaller than the sum of its proper divisors (23124444484).

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

21022222220 is a wasteful number, since it uses less digits than its factorization.

21022222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051111120 (or 1051111118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21022222220 its reverse (2222222012), we get a palindrome (23244444232).

The spelling of 21022222220 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty".