22013021 has 2 divisors, whose sum is σ = 22013022. Its totient is φ = 22013020.

The previous prime is 22012981. The next prime is 22013029. The reversal of 22013021 is 12031022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15912121 + 6100900 = 3989^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013021 - 2⁶ = 22012957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22012993 and 22013011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22013029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006510 + 11006511.

It is an arithmetic number, because the mean of its divisors is an integer number (11006511).

Almost surely, 2^22013021 is an apocalyptic number.

It is an amenable number.

22013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013021 is an equidigital number, since it uses as much as digits as its factorization.

22013021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 22013021 is about 4691.8035977649. The cubic root of 22013021 is about 280.2592030025.

Adding to 22013021 its reverse (12031022), we get a palindrome (34044043).

The spelling of 22013021 in words is "twenty-two million, thirteen thousand, twenty-one".