21222120100122 has 24 divisors (see below), whose sum is σ = 46147257557076. Its totient is φ = 7048501981056.

The previous prime is 21222120100109. The next prime is 21222120100123. The reversal of 21222120100122 is 22100102122212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21133227273921 + 88892826201 = 4597089^2 + 298149^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21222120100095 and 21222120100104.

It is not an unprimeable number, because it can be changed into a prime (21222120100123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2128165903 + ... + 2128175874.

Almost surely, 2^{21222120100122} is an apocalyptic number.

21222120100122 is an abundant number, since it is smaller than the sum of its proper divisors (24925137456954).

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

21222120100122 is a wasteful number, since it uses less digits than its factorization.

21222120100122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256342062 (or 4256342059 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120100122 its reverse (22100102122212), we get a palindrome (43322222222334).

The spelling of 21222120100122 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred thousand, one hundred twenty-two".