22144164421 has 4 divisors (see below), whose sum is σ = 22145348844. Its totient is φ = 22142980000.

The previous prime is 22144164391. The next prime is 22144164431. The reversal of 22144164421 is 12446144122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12446144122 = 2 ⋅6223072061.

It can be written as a sum of positive squares in 2 ways, for example, as 3126375396 + 19017789025 = 55914^2 + 137905^2 .

It is a cyclic number.

It is not a de Polignac number, because 22144164421 - 2⁷ = 22144164293 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22144164431) 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, 563710 + ... + 601711.

It is an arithmetic number, because the mean of its divisors is an integer number (5536337211).

Almost surely, 2^22144164421 is an apocalyptic number.

It is an amenable number.

22144164421 is a deficient number, since it is larger than the sum of its proper divisors (1184423).

22144164421 is a wasteful number, since it uses less digits than its factorization.

22144164421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184422.

The product of its digits is 12288, while the sum is 31.

The spelling of 22144164421 in words is "twenty-two billion, one hundred forty-four million, one hundred sixty-four thousand, four hundred twenty-one".