2121931 has 8 divisors (see below), whose sum is σ = 2437344. Its totient is φ = 1809600.

The previous prime is 2121907. The next prime is 2121941. The reversal of 2121931 is 1391212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121931 - 2⁷ = 2121803 is a prime.

It is a super-2 number, since 2×2121931² = 9005182337522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121899 and 2121908.

It is not an unprimeable number, because it can be changed into a prime (2121941) 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, 981 + ... + 2281.

It is an arithmetic number, because the mean of its divisors is an integer number (304668).

2^2121931 is an apocalyptic number.

2121931 is a deficient number, since it is larger than the sum of its proper divisors (315413).

2121931 is a wasteful number, since it uses less digits than its factorization.

2121931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541.

The product of its digits is 108, while the sum is 19.

The square root of 2121931 is about 1456.6849350494. The cubic root of 2121931 is about 128.5021574529.

It can be divided in two parts, 21 and 21931, that added together give a cube (21952 = 28³).

The spelling of 2121931 in words is "two million, one hundred twenty-one thousand, nine hundred thirty-one".