21222310220 has 24 divisors (see below), whose sum is σ = 46504541664. Its totient is φ = 8119840256.

The previous prime is 21222310169. The next prime is 21222310223. The reversal of 21222310220 is 2201322212.

It is not an unprimeable number, because it can be changed into a prime (21222310223) 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, 23067269 + ... + 23068188.

It is an arithmetic number, because the mean of its divisors is an integer number (1937689236).

Almost surely, 2^21222310220 is an apocalyptic number.

21222310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222310220 is an abundant number, since it is smaller than the sum of its proper divisors (25282231444).

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

21222310220 is a wasteful number, since it uses less digits than its factorization.

21222310220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46135489 (or 46135487 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21222310220 its reverse (2201322212), we get a palindrome (23423632432).

The spelling of 21222310220 in words is "twenty-one billion, two hundred twenty-two million, three hundred ten thousand, two hundred twenty".