22721122 has 4 divisors (see below), whose sum is σ = 34081686. Its totient is φ = 11360560.

The previous prime is 22721117. The next prime is 22721137. The reversal of 22721122 is 22112722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19793601 + 2927521 = 4449^2 + 1711^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22721122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5680279 + ... + 5680282.

Almost surely, 2^22721122 is an apocalyptic number.

22721122 is a deficient number, since it is larger than the sum of its proper divisors (11360564).

22721122 is a wasteful number, since it uses less digits than its factorization.

22721122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11360563.

The product of its digits is 224, while the sum is 19.

The square root of 22721122 is about 4766.6678088577. The cubic root of 22721122 is about 283.2326122577.

Adding to 22721122 its reverse (22112722), we get a palindrome (44833844).

Subtracting from 22721122 its reverse (22112722), we obtain a square (608400 = 780²).

The spelling of 22721122 in words is "twenty-two million, seven hundred twenty-one thousand, one hundred twenty-two".