10231537721 has 2 divisors, whose sum is σ = 10231537722. Its totient is φ = 10231537720.

The previous prime is 10231537681. The next prime is 10231537733. The reversal of 10231537721 is 12773513201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8987988025 + 1243549696 = 94805^2 + 35264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10231537721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10231537781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5115768860 + 5115768861.

It is an arithmetic number, because the mean of its divisors is an integer number (5115768861).

Almost surely, 2^10231537721 is an apocalyptic number.

It is an amenable number.

10231537721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10231537721 is an equidigital number, since it uses as much as digits as its factorization.

10231537721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 32.

The spelling of 10231537721 in words is "ten billion, two hundred thirty-one million, five hundred thirty-seven thousand, seven hundred twenty-one".