2121178404 has 24 divisors (see below), whose sum is σ = 5164608960. Its totient is φ = 676317664.

The previous prime is 2121178403. The next prime is 2121178459. The reversal of 2121178404 is 4048711212.

It is not an unprimeable number, because it can be changed into a prime (2121178403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3842439 + ... + 3842990.

It is an arithmetic number, because the mean of its divisors is an integer number (215192040).

Almost surely, 2^2121178404 is an apocalyptic number.

It is an amenable number.

2121178404 is an abundant number, since it is smaller than the sum of its proper divisors (3043430556).

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

2121178404 is a wasteful number, since it uses less digits than its factorization.

2121178404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685459 (or 7685457 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 2121178404 is about 46056.2526048310. The cubic root of 2121178404 is about 1284.8696348643.

Adding to 2121178404 its reverse (4048711212), we get a palindrome (6169889616).

The spelling of 2121178404 in words is "two billion, one hundred twenty-one million, one hundred seventy-eight thousand, four hundred four".