22212779 has 4 divisors (see below), whose sum is σ = 23178576. Its totient is φ = 21246984.

The previous prime is 22212763. The next prime is 22212787. The reversal of 22212779 is 97721222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97721222 = 2 ⋅48860611.

It is a cyclic number.

It is not a de Polignac number, because 22212779 - 2⁴ = 22212763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22212719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482864 + ... + 482909.

It is an arithmetic number, because the mean of its divisors is an integer number (5794644).

Almost surely, 2^22212779 is an apocalyptic number.

22212779 is a deficient number, since it is larger than the sum of its proper divisors (965797).

22212779 is an equidigital number, since it uses as much as digits as its factorization.

22212779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965796.

The product of its digits is 7056, while the sum is 32.

The square root of 22212779 is about 4713.0434965105. The cubic root of 22212779 is about 281.1043925145.

The spelling of 22212779 in words is "twenty-two million, two hundred twelve thousand, seven hundred seventy-nine".