3123321021 has 24 divisors (see below), whose sum is σ = 4661429760. Its totient is φ = 2013127200.

The previous prime is 3123321013. The next prime is 3123321049. The reversal of 3123321021 is 1201233213.

3123321021 is a `hidden beast` number, since 312 + 332 + 1 + 0 + 21 = 666.

3123321021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3123321021 - 2³ = 3123321013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3123320985 and 3123321003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123326021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324760 + ... + 334238.

It is an arithmetic number, because the mean of its divisors is an integer number (194226240).

Almost surely, 2^3123321021 is an apocalyptic number.

3123321021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3123321021 is a deficient number, since it is larger than the sum of its proper divisors (1538108739).

3123321021 is a wasteful number, since it uses less digits than its factorization.

3123321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10697 (or 10694 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 3123321021 is about 55886.6801751544. The cubic root of 3123321021 is about 1461.7469894337.

Adding to 3123321021 its reverse (1201233213), we get a palindrome (4324554234).

The spelling of 3123321021 in words is "three billion, one hundred twenty-three million, three hundred twenty-one thousand, twenty-one".