23022331721 has 2 divisors, whose sum is σ = 23022331722. Its totient is φ = 23022331720.

The previous prime is 23022331693. The next prime is 23022331751. The reversal of 23022331721 is 12713322032.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19359661321 + 3662670400 = 139139^2 + 60520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23022331721 is a prime.

It is not a weakly prime, because it can be changed into another prime (23022331751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11511165860 + 11511165861.

It is an arithmetic number, because the mean of its divisors is an integer number (11511165861).

Almost surely, 2^23022331721 is an apocalyptic number.

It is an amenable number.

23022331721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23022331721 is an equidigital number, since it uses as much as digits as its factorization.

23022331721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 23022331721 its reverse (12713322032), we get a palindrome (35735653753).

The spelling of 23022331721 in words is "twenty-three billion, twenty-two million, three hundred thirty-one thousand, seven hundred twenty-one".