315152142421 has 2 divisors, whose sum is σ = 315152142422. Its totient is φ = 315152142420.

The previous prime is 315152142407. The next prime is 315152142463. The reversal of 315152142421 is 124241251513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310889880625 + 4262261796 = 557575^2 + 65286^2 .

It is a cyclic number.

It is not a de Polignac number, because 315152142421 - 2³³ = 306562207829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315152142521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157576071210 + 157576071211.

It is an arithmetic number, because the mean of its divisors is an integer number (157576071211).

Almost surely, 2^315152142421 is an apocalyptic number.

It is an amenable number.

315152142421 is a deficient number, since it is larger than the sum of its proper divisors (1).

315152142421 is an equidigital number, since it uses as much as digits as its factorization.

315152142421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 31.

Adding to 315152142421 its reverse (124241251513), we get a palindrome (439393393934).

The spelling of 315152142421 in words is "three hundred fifteen billion, one hundred fifty-two million, one hundred forty-two thousand, four hundred twenty-one".