3123210121 has 4 divisors (see below), whose sum is σ = 3123534544. Its totient is φ = 3122885700.

The previous prime is 3123210073. The next prime is 3123210127. The reversal of 3123210121 is 1210123213.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3123210121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3123210095 and 3123210104.

It is not an unprimeable number, because it can be changed into a prime (3123210127) 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, 147315 + ... + 167176.

It is an arithmetic number, because the mean of its divisors is an integer number (780883636).

Almost surely, 2^3123210121 is an apocalyptic number.

It is an amenable number.

3123210121 is a deficient number, since it is larger than the sum of its proper divisors (324423).

3123210121 is an equidigital number, since it uses as much as digits as its factorization.

3123210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324422.

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

The square root of 3123210121 is about 55885.6879800186. The cubic root of 3123210121 is about 1461.7296884413.

Adding to 3123210121 its reverse (1210123213), we get a palindrome (4333333334).

The spelling of 3123210121 in words is "three billion, one hundred twenty-three million, two hundred ten thousand, one hundred twenty-one".