3123043021 has 16 divisors (see below), whose sum is σ = 3871324800. Its totient is φ = 2457976320.

The previous prime is 3123042997. The next prime is 3123043043. The reversal of 3123043021 is 1203403213.

It is a cyclic number.

It is not a de Polignac number, because 3123043021 - 2¹⁹ = 3122518733 is a prime.

It is a super-2 number, since 2×3123043021² = 19506795422033612882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3123043021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123043051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315171 + ... + 324928.

It is an arithmetic number, because the mean of its divisors is an integer number (241957800).

Almost surely, 2^3123043021 is an apocalyptic number.

It is an amenable number.

3123043021 is a deficient number, since it is larger than the sum of its proper divisors (748281779).

3123043021 is a wasteful number, since it uses less digits than its factorization.

3123043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640164.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 3123043021 is about 55884.1929439801. The cubic root of 3123043021 is about 1461.7036191752.

Adding to 3123043021 its reverse (1203403213), we get a palindrome (4326446234).

The spelling of 3123043021 in words is "three billion, one hundred twenty-three million, forty-three thousand, twenty-one".