22100212121221 has 4 divisors (see below), whose sum is σ = 23800228438252. Its totient is φ = 20400195804192.

The previous prime is 22100212121123. The next prime is 22100212121231. The reversal of 22100212121221 is 12212121200122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6060267221121 + 16039944900100 = 2461761^2 + 4004990^2 .

It is a cyclic number.

It is not a de Polignac number, because 22100212121221 - 2¹¹ = 22100212119173 is a prime.

It is a super-2 number, since 2×22100212121221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100212121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850008158496 + ... + 850008158521.

It is an arithmetic number, because the mean of its divisors is an integer number (5950057109563).

Almost surely, 2^{22100212121221} is an apocalyptic number.

It is an amenable number.

22100212121221 is a deficient number, since it is larger than the sum of its proper divisors (1700016317031).

22100212121221 is a wasteful number, since it uses less digits than its factorization.

22100212121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700016317030.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22100212121221 its reverse (12212121200122), we get a palindrome (34312333321343).

The spelling of 22100212121221 in words is "twenty-two trillion, one hundred billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".