3121420321 has 16 divisors (see below), whose sum is σ = 3313142784. Its totient is φ = 2934567504.

The previous prime is 3121420297. The next prime is 3121420333. The reversal of 3121420321 is 1230241213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3121420321 - 2¹⁹ = 3120896033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121420361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773110 + ... + 777136.

It is an arithmetic number, because the mean of its divisors is an integer number (207071424).

Almost surely, 2^3121420321 is an apocalyptic number.

It is an amenable number.

3121420321 is a deficient number, since it is larger than the sum of its proper divisors (191722463).

3121420321 is a wasteful number, since it uses less digits than its factorization.

3121420321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620.

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

The square root of 3121420321 is about 55869.6726408881. The cubic root of 3121420321 is about 1461.4504134213.

Adding to 3121420321 its reverse (1230241213), we get a palindrome (4351661534).

The spelling of 3121420321 in words is "three billion, one hundred twenty-one million, four hundred twenty thousand, three hundred twenty-one".