22821722 has 16 divisors (see below), whose sum is σ = 42679872. Its totient is φ = 8891520.

The previous prime is 22821703. The next prime is 22821737. The reversal of 22821722 is 22712822.

It is a junction number, because it is equal to n+sod(n) for n = 22821691 and 22821700.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73943 + ... + 74250.

It is an arithmetic number, because the mean of its divisors is an integer number (2667492).

Almost surely, 2^22821722 is an apocalyptic number.

22821722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22821722 is a deficient number, since it is larger than the sum of its proper divisors (19858150).

22821722 is a wasteful number, since it uses less digits than its factorization.

22821722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148213.

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

The square root of 22821722 is about 4777.2085991717. The cubic root of 22821722 is about 283.6500102451.

Subtracting from 22821722 its reverse (22712822), we obtain a square (108900 = 330²).

It can be divided in two parts, 2282 and 1722, that added together give a palindrome (4004).

The spelling of 22821722 in words is "twenty-two million, eight hundred twenty-one thousand, seven hundred twenty-two".