22112131421 has 4 divisors (see below), whose sum is σ = 23412845052. Its totient is φ = 20811417792.

The previous prime is 22112131399. The next prime is 22112131469. The reversal of 22112131421 is 12413121122.

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 6633288025 + 15478843396 = 81445^2 + 124414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22112131421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22112131393 and 22112131402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112131121) 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, 650356790 + ... + 650356823.

It is an arithmetic number, because the mean of its divisors is an integer number (5853211263).

Almost surely, 2^22112131421 is an apocalyptic number.

It is an amenable number.

22112131421 is a deficient number, since it is larger than the sum of its proper divisors (1300713631).

22112131421 is a wasteful number, since it uses less digits than its factorization.

22112131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300713630.

The product of its digits is 192, while the sum is 20.

Adding to 22112131421 its reverse (12413121122), we get a palindrome (34525252543).

The spelling of 22112131421 in words is "twenty-two billion, one hundred twelve million, one hundred thirty-one thousand, four hundred twenty-one".