22279321 has 4 divisors (see below), whose sum is σ = 22392612. Its totient is φ = 22166032.

The previous prime is 22279319. The next prime is 22279331. The reversal of 22279321 is 12397222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12397222 = 2 ⋅6198611.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 2822400 = 4411^2 + 1680^2 .

It is a cyclic number.

It is not a de Polignac number, because 22279321 - 2¹ = 22279319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22279321.

It is not an unprimeable number, because it can be changed into a prime (22279331) 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, 56350 + ... + 56743.

It is an arithmetic number, because the mean of its divisors is an integer number (5598153).

Almost surely, 2^22279321 is an apocalyptic number.

It is an amenable number.

22279321 is a deficient number, since it is larger than the sum of its proper divisors (113291).

22279321 is a wasteful number, since it uses less digits than its factorization.

22279321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113290.

The product of its digits is 3024, while the sum is 28.

The square root of 22279321 is about 4720.0975625510. The cubic root of 22279321 is about 281.3848106964.

The spelling of 22279321 in words is "twenty-two million, two hundred seventy-nine thousand, three hundred twenty-one".