21211100222120 has 16 divisors (see below), whose sum is σ = 47724975499860. Its totient is φ = 8484440088832.

The previous prime is 21211100222111. The next prime is 21211100222161. The reversal of 21211100222120 is 2122200111212.

It can be written as a sum of positive squares in 2 ways, for example, as 17169802173316 + 4041298048804 = 4143646^2 + 2010298^2 .

It is a super-2 number, since 2×21211100222120² (a number of 27 digits) contains 22 as substring.

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, 265138752737 + ... + 265138752816.

Almost surely, 2^{21211100222120} is an apocalyptic number.

21211100222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211100222120 is an abundant number, since it is smaller than the sum of its proper divisors (26513875277740).

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

21211100222120 is a wasteful number, since it uses less digits than its factorization.

21211100222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530277505564 (or 530277505560 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211100222120 its reverse (2122200111212), we get a palindrome (23333300333332).

The spelling of 21211100222120 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, two hundred twenty-two thousand, one hundred twenty".