22128722 has 24 divisors (see below), whose sum is σ = 41700288. Its totient is φ = 8620920.

The previous prime is 22128721. The next prime is 22128727. The reversal of 22128722 is 22782122.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 22128691 and 22128700.

It is not an unprimeable number, because it can be changed into a prime (22128721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4838 + ... + 8225.

It is an arithmetic number, because the mean of its divisors is an integer number (1737512).

Almost surely, 2^22128722 is an apocalyptic number.

22128722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22128722 is a deficient number, since it is larger than the sum of its proper divisors (19571566).

22128722 is a wasteful number, since it uses less digits than its factorization.

22128722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13094 (or 13083 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 22128722 is about 4704.1175580549. The cubic root of 22128722 is about 280.7493617477.

The spelling of 22128722 in words is "twenty-two million, one hundred twenty-eight thousand, seven hundred twenty-two".