22021237 has 12 divisors (see below), whose sum is σ = 26501580. Its totient is φ = 18223296.

The previous prime is 22021229. The next prime is 22021249. The reversal of 22021237 is 73212022.

It can be written as a sum of positive squares in 2 ways, for example, as 17522596 + 4498641 = 4186^2 + 2121^2 .

It is not a de Polignac number, because 22021237 - 2³ = 22021229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6328 + ... + 9169.

It is an arithmetic number, because the mean of its divisors is an integer number (2208465).

Almost surely, 2^22021237 is an apocalyptic number.

It is an amenable number.

22021237 is a deficient number, since it is larger than the sum of its proper divisors (4480343).

22021237 is a wasteful number, since it uses less digits than its factorization.

22021237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15540 (or 15533 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 22021237 is about 4692.6790855544. The cubic root of 22021237 is about 280.2940660532.

Adding to 22021237 its reverse (73212022), we get a palindrome (95233259).

The spelling of 22021237 in words is "twenty-two million, twenty-one thousand, two hundred thirty-seven".