23232261721 has 2 divisors, whose sum is σ = 23232261722. Its totient is φ = 23232261720.

The previous prime is 23232261691. The next prime is 23232261743. The reversal of 23232261721 is 12716223232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23183107600 + 49154121 = 152260^2 + 7011^2 .

It is a cyclic number.

It is not a de Polignac number, because 23232261721 - 2²¹ = 23230164569 is a prime.

It is not a weakly prime, because it can be changed into another prime (23232261121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11616130860 + 11616130861.

It is an arithmetic number, because the mean of its divisors is an integer number (11616130861).

Almost surely, 2^23232261721 is an apocalyptic number.

It is an amenable number.

23232261721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23232261721 is an equidigital number, since it uses as much as digits as its factorization.

23232261721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

Adding to 23232261721 its reverse (12716223232), we get a palindrome (35948484953).

The spelling of 23232261721 in words is "twenty-three billion, two hundred thirty-two million, two hundred sixty-one thousand, seven hundred twenty-one".