5401999342721 has 2 divisors, whose sum is σ = 5401999342722. Its totient is φ = 5401999342720.

The previous prime is 5401999342717. The next prime is 5401999342741. The reversal of 5401999342721 is 1272439991045.

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., 4967375595121 + 434623747600 = 2228761^2 + 659260^2 .

It is a cyclic number.

It is not a de Polignac number, because 5401999342721 - 2² = 5401999342717 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 (5401999342741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2700999671360 + 2700999671361.

It is an arithmetic number, because the mean of its divisors is an integer number (2700999671361).

Almost surely, 2^{5401999342721} is an apocalyptic number.

It is an amenable number.

5401999342721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5401999342721 is an equidigital number, since it uses as much as digits as its factorization.

5401999342721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 5401999342721 in words is "five trillion, four hundred one billion, nine hundred ninety-nine million, three hundred forty-two thousand, seven hundred twenty-one".