22101221002120 has 32 divisors (see below), whose sum is σ = 53552958583320. Its totient is φ = 8160450831360.

The previous prime is 22101221002043. The next prime is 22101221002123. The reversal of 22101221002120 is 2120012210122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8950400525284 + 13150820476836 = 2991722^2 + 3626406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22101221002094 and 22101221002103.

It is not an unprimeable number, because it can be changed into a prime (22101221002123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21251173521 + ... + 21251174560.

Almost surely, 2^{22101221002120} is an apocalyptic number.

22101221002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22101221002120 is an abundant number, since it is smaller than the sum of its proper divisors (31451737581200).

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

22101221002120 is a wasteful number, since it uses less digits than its factorization.

22101221002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42502348105 (or 42502348101 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22101221002120 its reverse (2120012210122), we get a palindrome (24221233212242).

The spelling of 22101221002120 in words is "twenty-two trillion, one hundred one billion, two hundred twenty-one million, two thousand, one hundred twenty".