2121702678 has 48 divisors (see below), whose sum is σ = 4930314480. Its totient is φ = 657364032.

The previous prime is 2121702647. The next prime is 2121702683. The reversal of 2121702678 is 8762071212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40401 + ... + 76652.

It is an arithmetic number, because the mean of its divisors is an integer number (102714885).

Almost surely, 2^2121702678 is an apocalyptic number.

2121702678 is an abundant number, since it is smaller than the sum of its proper divisors (2808611802).

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

2121702678 is a wasteful number, since it uses less digits than its factorization.

2121702678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117133 (or 117130 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 2121702678 is about 46061.9439233734. The cubic root of 2121702678 is about 1284.9754829864.

The spelling of 2121702678 in words is "two billion, one hundred twenty-one million, seven hundred two thousand, six hundred seventy-eight".