22021772 has 12 divisors (see below), whose sum is σ = 38601696. Its totient is φ = 10992720.

The previous prime is 22021739. The next prime is 22021799. The reversal of 22021772 is 27712022.

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, 1604 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (3216808).

Almost surely, 2^22021772 is an apocalyptic number.

It is an amenable number.

22021772 is a deficient number, since it is larger than the sum of its proper divisors (16579924).

22021772 is a wasteful number, since it uses less digits than its factorization.

22021772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9088 (or 9086 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 22021772 is about 4692.7360888931. The cubic root of 22021772 is about 280.2963359243.

Adding to 22021772 its reverse (27712022), we get a palindrome (49733794).

The spelling of 22021772 in words is "twenty-two million, twenty-one thousand, seven hundred seventy-two".