21011222222120 has 96 divisors (see below), whose sum is σ = 54082785720600. Its totient is φ = 7301637353472.

The previous prime is 21011222222077. The next prime is 21011222222141. The reversal of 21011222222120 is 2122222211012.

It can be written as a sum of positive squares in 12 ways, for example, as 7974399914404 + 13036822307716 = 2823898^2 + 3610654^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21011222222092 and 21011222222101.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69756635 + ... + 70057194.

Almost surely, 2^{21011222222120} is an apocalyptic number.

21011222222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011222222120 is an abundant number, since it is smaller than the sum of its proper divisors (33071563498480).

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

21011222222120 is a wasteful number, since it uses less digits than its factorization.

21011222222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139813887 (or 139813866 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21011222222120 its reverse (2122222211012), we get a palindrome (23133444433132).

The spelling of 21011222222120 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty".