22021012 has 12 divisors (see below), whose sum is σ = 41501236. Its totient is φ = 10163520.

The previous prime is 22021009. The next prime is 22021049. The reversal of 22021012 is 21012022.

It can be written as a sum of positive squares in 2 ways, for example, as 1354896 + 20666116 = 1164^2 + 4546^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22021012.

It is a congruent number.

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, 211689 + ... + 211792.

Almost surely, 2^22021012 is an apocalyptic number.

It is an amenable number.

22021012 is a deficient number, since it is larger than the sum of its proper divisors (19480224).

22021012 is a wasteful number, since it uses less digits than its factorization.

22021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423498 (or 423496 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22021012 is about 4692.6551119808. The cubic root of 22021012 is about 280.2931114235.

Adding to 22021012 its reverse (21012022), we get a palindrome (43033034).

The spelling of 22021012 in words is "twenty-two million, twenty-one thousand, twelve".