2021931 has 12 divisors (see below), whose sum is σ = 2934880. Its totient is φ = 1341360.

The previous prime is 2021927. The next prime is 2021933. The reversal of 2021931 is 1391202.

It is a happy number.

It is not a de Polignac number, because 2021931 - 2² = 2021927 is a prime.

It is a super-2 number, since 2×2021931² = 8176409937522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2025 + ... + 2853.

2^2021931 is an apocalyptic number.

2021931 is a deficient number, since it is larger than the sum of its proper divisors (912949).

2021931 is a wasteful number, since it uses less digits than its factorization.

2021931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2021931 is about 1421.9462015140. The cubic root of 2021931 is about 126.4509540268.

The spelling of 2021931 in words is "two million, twenty-one thousand, nine hundred thirty-one".