2378136821 has 16 divisors (see below), whose sum is σ = 2501790720. Its totient is φ = 2257839360.

The previous prime is 2378136811. The next prime is 2378136823. The reversal of 2378136821 is 1286318732.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2378136821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2378136823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344621 + ... + 351453.

It is an arithmetic number, because the mean of its divisors is an integer number (156361920).

Almost surely, 2^2378136821 is an apocalyptic number.

It is an amenable number.

2378136821 is a deficient number, since it is larger than the sum of its proper divisors (123653899).

2378136821 is a wasteful number, since it uses less digits than its factorization.

2378136821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076.

The product of its digits is 96768, while the sum is 41.

The square root of 2378136821 is about 48766.1442088669. The cubic root of 2378136821 is about 1334.7879553055.

The spelling of 2378136821 in words is "two billion, three hundred seventy-eight million, one hundred thirty-six thousand, eight hundred twenty-one".