6315378021 has 12 divisors (see below), whose sum is σ = 9124023948. Its totient is φ = 4209416064.

The previous prime is 6315377989. The next prime is 6315378031. The reversal of 6315378021 is 1208735136.

It can be written as a sum of positive squares in 2 ways, for example, as 5732155521 + 583222500 = 75711^2 + 24150^2 .

It is not a de Polignac number, because 6315378021 - 2⁵ = 6315377989 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6315378031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19950 + ... + 114143.

It is an arithmetic number, because the mean of its divisors is an integer number (760335329).

Almost surely, 2^6315378021 is an apocalyptic number.

It is an amenable number.

6315378021 is a deficient number, since it is larger than the sum of its proper divisors (2808645927).

6315378021 is a wasteful number, since it uses less digits than its factorization.

6315378021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139332 (or 139329 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 6315378021 is about 79469.3527153707. The cubic root of 6315378021 is about 1848.4162750960.

The spelling of 6315378021 in words is "six billion, three hundred fifteen million, three hundred seventy-eight thousand, twenty-one".