93805840721 has 2 divisors, whose sum is σ = 93805840722. Its totient is φ = 93805840720.

The previous prime is 93805840717. The next prime is 93805840769. The reversal of 93805840721 is 12704850839.

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., 89738590096 + 4067250625 = 299564^2 + 63775^2 .

It is a cyclic number.

It is not a de Polignac number, because 93805840721 - 2² = 93805840717 is a prime.

It is not a weakly prime, because it can be changed into another prime (93805840021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46902920360 + 46902920361.

It is an arithmetic number, because the mean of its divisors is an integer number (46902920361).

Almost surely, 2^93805840721 is an apocalyptic number.

It is an amenable number.

93805840721 is a deficient number, since it is larger than the sum of its proper divisors (1).

93805840721 is an equidigital number, since it uses as much as digits as its factorization.

93805840721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 93805840721 in words is "ninety-three billion, eight hundred five million, eight hundred forty thousand, seven hundred twenty-one".