22756021 has 2 divisors, whose sum is σ = 22756022. Its totient is φ = 22756020.

The previous prime is 22756009. The next prime is 22756031. The reversal of 22756021 is 12065722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 562500 = 4711^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 22756021 - 2¹⁷ = 22624949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22756031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11378010 + 11378011.

It is an arithmetic number, because the mean of its divisors is an integer number (11378011).

Almost surely, 2^22756021 is an apocalyptic number.

It is an amenable number.

22756021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22756021 is an equidigital number, since it uses as much as digits as its factorization.

22756021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 22756021 is about 4770.3271376290. The cubic root of 22756021 is about 283.3775505001.

The spelling of 22756021 in words is "twenty-two million, seven hundred fifty-six thousand, twenty-one".