22111020121 has 4 divisors (see below), whose sum is σ = 22113014500. Its totient is φ = 22109025744.

The previous prime is 22111020083. The next prime is 22111020179. The reversal of 22111020121 is 12102011122.

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 7863255625 + 14247764496 = 88675^2 + 119364^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111020121 - 2⁷ = 22111019993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22111020221) 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, 980466 + ... + 1002763.

It is an arithmetic number, because the mean of its divisors is an integer number (5528253625).

Almost surely, 2^22111020121 is an apocalyptic number.

It is an amenable number.

22111020121 is a deficient number, since it is larger than the sum of its proper divisors (1994379).

22111020121 is a wasteful number, since it uses less digits than its factorization.

22111020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994378.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22111020121 its reverse (12102011122), we get a palindrome (34213031243).

The spelling of 22111020121 in words is "twenty-two billion, one hundred eleven million, twenty thousand, one hundred twenty-one".