3031000021 has 16 divisors (see below), whose sum is σ = 3511973376. Its totient is φ = 2562237936.

The previous prime is 3031000009. The next prime is 3031000033. The reversal of 3031000021 is 1200001303.

It is an interprime number because it is at equal distance from previous prime (3031000009) and next prime (3031000033).

It is a cyclic number.

It is not a de Polignac number, because 3031000021 - 2²⁷ = 2896782293 is a prime.

It is a super-2 number, since 2×3031000021² = 18373922254604000882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3030999971 and 3031000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3031001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161110 + ... + 178936.

It is an arithmetic number, because the mean of its divisors is an integer number (219498336).

Almost surely, 2^3031000021 is an apocalyptic number.

It is an amenable number.

3031000021 is a deficient number, since it is larger than the sum of its proper divisors (480973355).

3031000021 is a wasteful number, since it uses less digits than its factorization.

3031000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18168.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 3031000021 is about 55054.5186247233. The cubic root of 3031000021 is about 1447.2003085948.

Adding to 3031000021 its reverse (1200001303), we get a palindrome (4231001324).

The spelling of 3031000021 in words is "three billion, thirty-one million, twenty-one", and thus it is an aban number and an uban number.