3123210421 has 4 divisors (see below), whose sum is σ = 3126234892. Its totient is φ = 3120185952.

The previous prime is 3123210379. The next prime is 3123210449. The reversal of 3123210421 is 1240123213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1706516100 + 1416694321 = 41310^2 + 37639^2 .

It is a cyclic number.

It is not a de Polignac number, because 3123210421 - 2⁹ = 3123209909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123210491) 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, 1510686 + ... + 1512751.

It is an arithmetic number, because the mean of its divisors is an integer number (781558723).

Almost surely, 2^3123210421 is an apocalyptic number.

It is an amenable number.

3123210421 is a deficient number, since it is larger than the sum of its proper divisors (3024471).

3123210421 is a wasteful number, since it uses less digits than its factorization.

3123210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024470.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 3123210421 is about 55885.6906640689. The cubic root of 3123210421 is about 1461.7297352434.

Adding to 3123210421 its reverse (1240123213), we get a palindrome (4363333634).

The spelling of 3123210421 in words is "three billion, one hundred twenty-three million, two hundred ten thousand, four hundred twenty-one".