3123116021 has 4 divisors (see below), whose sum is σ = 3123235500. Its totient is φ = 3122996544.

The previous prime is 3123116011. The next prime is 3123116047. The reversal of 3123116021 is 1206113213.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 791578225 + 2331537796 = 28135^2 + 48286^2 .

It is a cyclic number.

It is not a de Polignac number, because 3123116021 - 2¹⁰ = 3123114997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3123115984 and 3123116002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123116011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796 + ... + 79053.

It is an arithmetic number, because the mean of its divisors is an integer number (780808875).

Almost surely, 2^3123116021 is an apocalyptic number.

It is an amenable number.

3123116021 is a deficient number, since it is larger than the sum of its proper divisors (119479).

3123116021 is an equidigital number, since it uses as much as digits as its factorization.

3123116021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119478.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 3123116021 is about 55884.8460765528. The cubic root of 3123116021 is about 1461.7150080174.

Adding to 3123116021 its reverse (1206113213), we get a palindrome (4329229234).

The spelling of 3123116021 in words is "three billion, one hundred twenty-three million, one hundred sixteen thousand, twenty-one".