2121312108 has 24 divisors (see below), whose sum is σ = 5012385280. Its totient is φ = 698153040.

The previous prime is 2121312107. The next prime is 2121312119. The reversal of 2121312108 is 8012131212.

It is not an unprimeable number, because it can be changed into a prime (2121312101) 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, 1117888 + ... + 1119783.

Almost surely, 2^2121312108 is an apocalyptic number.

It is an amenable number.

2121312108 is an abundant number, since it is smaller than the sum of its proper divisors (2891073172).

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

2121312108 is a wasteful number, since it uses less digits than its factorization.

2121312108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237757 (or 2237755 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 2121312108 is about 46057.7041112559. The cubic root of 2121312108 is about 1284.8966306448.

The spelling of 2121312108 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, one hundred eight".