315212403421 has 2 divisors, whose sum is σ = 315212403422. Its totient is φ = 315212403420.

The previous prime is 315212403403. The next prime is 315212403427. The reversal of 315212403421 is 124304212513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236963530521 + 78248872900 = 486789^2 + 279730^2 .

It is a cyclic number.

It is not a de Polignac number, because 315212403421 - 2³³ = 306622468829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315212403421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315212403427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157606201710 + 157606201711.

It is an arithmetic number, because the mean of its divisors is an integer number (157606201711).

Almost surely, 2^315212403421 is an apocalyptic number.

It is an amenable number.

315212403421 is a deficient number, since it is larger than the sum of its proper divisors (1).

315212403421 is an equidigital number, since it uses as much as digits as its factorization.

315212403421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 315212403421 its reverse (124304212513), we get a palindrome (439516615934).

The spelling of 315212403421 in words is "three hundred fifteen billion, two hundred twelve million, four hundred three thousand, four hundred twenty-one".