11733642721 has 2 divisors, whose sum is σ = 11733642722. Its totient is φ = 11733642720.

The previous prime is 11733642707. The next prime is 11733642757. The reversal of 11733642721 is 12724633711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11478122496 + 255520225 = 107136^2 + 15985^2 .

It is a cyclic number.

It is not a de Polignac number, because 11733642721 - 2⁵ = 11733642689 is a prime.

It is not a weakly prime, because it can be changed into another prime (11733642821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5866821360 + 5866821361.

It is an arithmetic number, because the mean of its divisors is an integer number (5866821361).

Almost surely, 2^11733642721 is an apocalyptic number.

It is an amenable number.

11733642721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11733642721 is an equidigital number, since it uses as much as digits as its factorization.

11733642721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The spelling of 11733642721 in words is "eleven billion, seven hundred thirty-three million, six hundred forty-two thousand, seven hundred twenty-one".