22502021 has 2 divisors, whose sum is σ = 22502022. Its totient is φ = 22502020.

The previous prime is 22502003. The next prime is 22502059. The reversal of 22502021 is 12020522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 81796 = 4735^2 + 286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22502021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22501987 and 22502005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22501021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11251010 + 11251011.

It is an arithmetic number, because the mean of its divisors is an integer number (11251011).

Almost surely, 2^22502021 is an apocalyptic number.

It is an amenable number.

22502021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22502021 is an equidigital number, since it uses as much as digits as its factorization.

22502021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 22502021 is about 4743.6295175741. The cubic root of 22502021 is about 282.3192610060.

Adding to 22502021 its reverse (12020522), we get a palindrome (34522543).

The spelling of 22502021 in words is "twenty-two million, five hundred two thousand, twenty-one".