22111221202121 has 4 divisors (see below), whose sum is σ = 23411881272852. Its totient is φ = 20810561131392.

The previous prime is 22111221202067. The next prime is 22111221202153. The reversal of 22111221202121 is 12120212211122.

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 19256202699721 + 2855018502400 = 4388189^2 + 1689680^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111221202121 - 2²⁶ = 22111154093257 is a prime.

It is a super-2 number, since 2×22111221202121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22111221202093 and 22111221202102.

It is not an unprimeable number, because it can be changed into a prime (22111221202181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650330035340 + ... + 650330035373.

It is an arithmetic number, because the mean of its divisors is an integer number (5852970318213).

Almost surely, 2^{22111221202121} is an apocalyptic number.

It is an amenable number.

22111221202121 is a deficient number, since it is larger than the sum of its proper divisors (1300660070731).

22111221202121 is a wasteful number, since it uses less digits than its factorization.

22111221202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300660070730.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22111221202121 its reverse (12120212211122), we get a palindrome (34231433413243).

The spelling of 22111221202121 in words is "twenty-two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-one".