23277721 has 2 divisors, whose sum is σ = 23277722. Its totient is φ = 23277720.

The previous prime is 23277719. The next prime is 23277733. The reversal of 23277721 is 12777232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 2016400 = 4611^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 23277721 - 2¹ = 23277719 is a prime.

Together with 23277719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23277781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11638860 + 11638861.

It is an arithmetic number, because the mean of its divisors is an integer number (11638861).

Almost surely, 2^23277721 is an apocalyptic number.

It is an amenable number.

23277721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23277721 is an equidigital number, since it uses as much as digits as its factorization.

23277721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232, while the sum is 31.

The square root of 23277721 is about 4824.6990579724. The cubic root of 23277721 is about 285.5267615078.

It can be divided in two parts, 2 and 3277721, that added together give a palindrome (3277723).

The spelling of 23277721 in words is "twenty-three million, two hundred seventy-seven thousand, seven hundred twenty-one".