21220101022220 has 24 divisors (see below), whose sum is σ = 44571651491808. Its totient is φ = 8486242438400.

The previous prime is 21220101022187. The next prime is 21220101022243. The reversal of 21220101022220 is 2222010102212.

It is a happy number.

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, 112276376 + ... + 112465215.

It is an arithmetic number, because the mean of its divisors is an integer number (1857152145492).

Almost surely, 2^{21220101022220} is an apocalyptic number.

21220101022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220101022220 is an abundant number, since it is smaller than the sum of its proper divisors (23351550469588).

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

21220101022220 is a wasteful number, since it uses less digits than its factorization.

21220101022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224746321 (or 224746319 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220101022220 its reverse (2222010102212), we get a palindrome (23442111124432).

The spelling of 21220101022220 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, twenty-two thousand, two hundred twenty".