3123002221 has 4 divisors (see below), whose sum is σ = 3306708252. Its totient is φ = 2939296192.

The previous prime is 3123002209. The next prime is 3123002251. The reversal of 3123002221 is 1222003213.

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 2161320100 + 961682121 = 46490^2 + 31011^2 .

It is not a de Polignac number, because 3123002221 - 2⁵ = 3123002189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3123002195 and 3123002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123002251) 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, 91852990 + ... + 91853023.

It is an arithmetic number, because the mean of its divisors is an integer number (826677063).

Almost surely, 2^3123002221 is an apocalyptic number.

It is an amenable number.

3123002221 is a deficient number, since it is larger than the sum of its proper divisors (183706031).

3123002221 is a wasteful number, since it uses less digits than its factorization.

3123002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183706030.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3123002221 is about 55883.8279021758. The cubic root of 3123002221 is about 1461.6972538271.

Adding to 3123002221 its reverse (1222003213), we get a palindrome (4345005434).

The spelling of 3123002221 in words is "three billion, one hundred twenty-three million, two thousand, two hundred twenty-one".