2121235478 has 16 divisors (see below), whose sum is σ = 3242690880. Its totient is φ = 1040510016.

The previous prime is 2121235463. The next prime is 2121235489. The reversal of 2121235478 is 8745321212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17951 + ... + 67562.

It is an arithmetic number, because the mean of its divisors is an integer number (202668180).

Almost surely, 2^2121235478 is an apocalyptic number.

2121235478 is a deficient number, since it is larger than the sum of its proper divisors (1121455402).

2121235478 is a wasteful number, since it uses less digits than its factorization.

2121235478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85751.

The product of its digits is 26880, while the sum is 35.

The square root of 2121235478 is about 46056.8722125157. The cubic root of 2121235478 is about 1284.8811586462.

The spelling of 2121235478 in words is "two billion, one hundred twenty-one million, two hundred thirty-five thousand, four hundred seventy-eight".