21222202220 has 24 divisors (see below), whose sum is σ = 44570853600. Its totient is φ = 8488075392.

The previous prime is 21222202207. The next prime is 21222202223. The reversal of 21222202220 is 2220222212.

It is not an unprimeable number, because it can be changed into a prime (21222202223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194816 + ... + 283544.

It is an arithmetic number, because the mean of its divisors is an integer number (1857118900).

Almost surely, 2^21222202220 is an apocalyptic number.

21222202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222202220 is an abundant number, since it is smaller than the sum of its proper divisors (23348651380).

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

21222202220 is a wasteful number, since it uses less digits than its factorization.

21222202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100697 (or 100695 counting only the distinct ones).

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

Adding to 21222202220 its reverse (2220222212), we get a palindrome (23442424432).

The spelling of 21222202220 in words is "twenty-one billion, two hundred twenty-two million, two hundred two thousand, two hundred twenty".