2102129878 has 8 divisors (see below), whose sum is σ = 3191185368. Its totient is φ = 1038401424.

The previous prime is 2102129833. The next prime is 2102129879. The reversal of 2102129878 is 8789212012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2102129878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102129879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6331551 + ... + 6331882.

It is an arithmetic number, because the mean of its divisors is an integer number (398898171).

Almost surely, 2^2102129878 is an apocalyptic number.

2102129878 is a deficient number, since it is larger than the sum of its proper divisors (1089055490).

2102129878 is a wasteful number, since it uses less digits than its factorization.

2102129878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12663518.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 2102129878 is about 45848.9899343486. The cubic root of 2102129878 is about 1281.0119516249.

The spelling of 2102129878 in words is "two billion, one hundred two million, one hundred twenty-nine thousand, eight hundred seventy-eight".