3123211021 has 4 divisors (see below), whose sum is σ = 3569384032. Its totient is φ = 2677038012.

The previous prime is 3123210997. The next prime is 3123211027. The reversal of 3123211021 is 1201123213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1201123213 = 1321 ⋅909253.

It is a cyclic number.

It is not a de Polignac number, because 3123211021 - 2²⁹ = 2586340109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3123210986 and 3123211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123211027) 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, 223086495 + ... + 223086508.

It is an arithmetic number, because the mean of its divisors is an integer number (892346008).

Almost surely, 2^3123211021 is an apocalyptic number.

It is an amenable number.

3123211021 is a deficient number, since it is larger than the sum of its proper divisors (446173011).

3123211021 is an equidigital number, since it uses as much as digits as its factorization.

3123211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446173010.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 3123211021 is about 55885.6960321691. The cubic root of 3123211021 is about 1461.7298288477.

Adding to 3123211021 its reverse (1201123213), we get a palindrome (4324334234).

The spelling of 3123211021 in words is "three billion, one hundred twenty-three million, two hundred eleven thousand, twenty-one".