321057457421 has 2 divisors, whose sum is σ = 321057457422. Its totient is φ = 321057457420.

The previous prime is 321057457393. The next prime is 321057457433. The reversal of 321057457421 is 124754750123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221492596900 + 99564860521 = 470630^2 + 315539^2 .

It is an emirp because it is prime and its reverse (124754750123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321057457421 - 2³⁸ = 46179550477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321057057421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160528728710 + 160528728711.

It is an arithmetic number, because the mean of its divisors is an integer number (160528728711).

Almost surely, 2^321057457421 is an apocalyptic number.

It is an amenable number.

321057457421 is a deficient number, since it is larger than the sum of its proper divisors (1).

321057457421 is an equidigital number, since it uses as much as digits as its factorization.

321057457421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 321057457421 in words is "three hundred twenty-one billion, fifty-seven million, four hundred fifty-seven thousand, four hundred twenty-one".