22163124721 has 8 divisors (see below), whose sum is σ = 22379540040. Its totient is φ = 21947501568.

The previous prime is 22163124719. The next prime is 22163124817. The reversal of 22163124721 is 12742136122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5522124721 + 16641000000 = 74311^2 + 129000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22163124721 - 2¹ = 22163124719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22163124701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141736 + ... + 253801.

It is an arithmetic number, because the mean of its divisors is an integer number (2797442505).

Almost surely, 2^22163124721 is an apocalyptic number.

It is an amenable number.

22163124721 is a deficient number, since it is larger than the sum of its proper divisors (216415319).

22163124721 is a wasteful number, since it uses less digits than its factorization.

22163124721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396083.

The product of its digits is 8064, while the sum is 31.

The spelling of 22163124721 in words is "twenty-two billion, one hundred sixty-three million, one hundred twenty-four thousand, seven hundred twenty-one".