22221722 has 8 divisors (see below), whose sum is σ = 33802272. Its totient is φ = 10954300.

The previous prime is 22221709. The next prime is 22221739. The reversal of 22221722 is 22712222.

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

It is a junction number, because it is equal to n+sod(n) for n = 22221694 and 22221703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78104 + ... + 78387.

It is an arithmetic number, because the mean of its divisors is an integer number (4225284).

Almost surely, 2^22221722 is an apocalyptic number.

22221722 is a deficient number, since it is larger than the sum of its proper divisors (11580550).

22221722 is a wasteful number, since it uses less digits than its factorization.

22221722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156564.

The product of its digits is 448, while the sum is 20.

The square root of 22221722 is about 4713.9921510329. The cubic root of 22221722 is about 281.1421122326.

Adding to 22221722 its reverse (22712222), we get a palindrome (44933944).

It can be divided in two parts, 222 and 21722, that multiplied together give a palindrome (4822284).

The spelling of 22221722 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred twenty-two".