721325423447 has 2 divisors, whose sum is σ = 721325423448. Its totient is φ = 721325423446.

The previous prime is 721325423431. The next prime is 721325423479. The reversal of 721325423447 is 744324523127.

It is a weak prime.

It is an emirp because it is prime and its reverse (744324523127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721325423447 - 2⁴ = 721325423431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721325423398 and 721325423407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721325423407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360662711723 + 360662711724.

It is an arithmetic number, because the mean of its divisors is an integer number (360662711724).

Almost surely, 2^721325423447 is an apocalyptic number.

721325423447 is a deficient number, since it is larger than the sum of its proper divisors (1).

721325423447 is an equidigital number, since it uses as much as digits as its factorization.

721325423447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 44.

The spelling of 721325423447 in words is "seven hundred twenty-one billion, three hundred twenty-five million, four hundred twenty-three thousand, four hundred forty-seven".