3121302221 has 8 divisors (see below), whose sum is σ = 3311648064. Its totient is φ = 2931705280.

The previous prime is 3121302169. The next prime is 3121302227. The reversal of 3121302221 is 1222031213.

3121302221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121302221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121302221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121302227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178625 + ... + 195318.

It is an arithmetic number, because the mean of its divisors is an integer number (413956008).

Almost surely, 2^3121302221 is an apocalyptic number.

It is an amenable number.

3121302221 is a deficient number, since it is larger than the sum of its proper divisors (190345843).

3121302221 is a wasteful number, since it uses less digits than its factorization.

3121302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374451.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3121302221 is about 55868.6157068528. The cubic root of 3121302221 is about 1461.4319816976.

Adding to 3121302221 its reverse (1222031213), we get a palindrome (4343333434).

The spelling of 3121302221 in words is "three billion, one hundred twenty-one million, three hundred two thousand, two hundred twenty-one".