2421378216 has 48 divisors (see below), whose sum is σ = 6586581300. Its totient is φ = 803596032.

The previous prime is 2421378209. The next prime is 2421378217. The reversal of 2421378216 is 6128731242.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2054808900 + 366569316 = 45330^2 + 19146^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2421378217) 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, 56941 + ... + 89916.

Almost surely, 2^2421378216 is an apocalyptic number.

It is an amenable number.

2421378216 is an abundant number, since it is smaller than the sum of its proper divisors (4165203084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2421378216 is a wasteful number, since it uses less digits than its factorization.

2421378216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147098 (or 147091 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 2421378216 is about 49207.5016232281. The cubic root of 2421378216 is about 1342.8295107854.

The spelling of 2421378216 in words is "two billion, four hundred twenty-one million, three hundred seventy-eight thousand, two hundred sixteen".