2121939 has 12 divisors (see below), whose sum is σ = 3226600. Its totient is φ = 1340064.

The previous prime is 2121907. The next prime is 2121941. The reversal of 2121939 is 9391212.

It is not a de Polignac number, because 2121939 - 2⁵ = 2121907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6034 + ... + 6375.

2^2121939 is an apocalyptic number.

2121939 is a deficient number, since it is larger than the sum of its proper divisors (1104661).

2121939 is a wasteful number, since it uses less digits than its factorization.

2121939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12434 (or 12431 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 2121939 is about 1456.6876810078. The cubic root of 2121939 is about 128.5023189436.

It can be divided in two parts, 21219 and 39, that multiplied together give a triangular number (827541 = T₁₂₈₆).

The spelling of 2121939 in words is "two million, one hundred twenty-one thousand, nine hundred thirty-nine".