21222100222120 has 64 divisors (see below), whose sum is σ = 54571827438720. Its totient is φ = 7276053636864.

The previous prime is 21222100222087. The next prime is 21222100222121. The reversal of 21222100222120 is 2122200122212.

It is not an unprimeable number, because it can be changed into a prime (21222100222121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22969819 + ... + 23875861.

It is an arithmetic number, because the mean of its divisors is an integer number (852684803730).

Almost surely, 2^{21222100222120} is an apocalyptic number.

21222100222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222100222120 is an abundant number, since it is smaller than the sum of its proper divisors (33349727216600).

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

21222100222120 is a wasteful number, since it uses less digits than its factorization.

21222100222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989714 (or 989710 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222100222120 its reverse (2122200122212), we get a palindrome (23344300344332).

The spelling of 21222100222120 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred million, two hundred twenty-two thousand, one hundred twenty".