22761721 has 2 divisors, whose sum is σ = 22761722. Its totient is φ = 22761720.

The previous prime is 22761701. The next prime is 22761731. The reversal of 22761721 is 12716722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17943696 + 4818025 = 4236^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 22761721 - 2¹³ = 22753529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22761721.

It is not a weakly prime, because it can be changed into another prime (22761701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11380860 + 11380861.

It is an arithmetic number, because the mean of its divisors is an integer number (11380861).

Almost surely, 2^22761721 is an apocalyptic number.

It is an amenable number.

22761721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22761721 is an equidigital number, since it uses as much as digits as its factorization.

22761721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 28.

The square root of 22761721 is about 4770.9245435240. The cubic root of 22761721 is about 283.4012089594.

The spelling of 22761721 in words is "twenty-two million, seven hundred sixty-one thousand, seven hundred twenty-one".