22012012121 has 4 divisors (see below), whose sum is σ = 24013104144. Its totient is φ = 20010920100.

The previous prime is 22012012081. The next prime is 22012012147. The reversal of 22012012121 is 12121021022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22012012121 - 2²⁶ = 21944903257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22012012096 and 22012012105.

It is not an unprimeable number, because it can be changed into a prime (22012012151) 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, 1000545995 + ... + 1000546016.

It is an arithmetic number, because the mean of its divisors is an integer number (6003276036).

Almost surely, 2^22012012121 is an apocalyptic number.

It is an amenable number.

22012012121 is a deficient number, since it is larger than the sum of its proper divisors (2001092023).

22012012121 is a wasteful number, since it uses less digits than its factorization.

22012012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001092022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22012012121 its reverse (12121021022), we get a palindrome (34133033143).

The spelling of 22012012121 in words is "twenty-two billion, twelve million, twelve thousand, one hundred twenty-one".