3123001221 has 4 divisors (see below), whose sum is σ = 4164001632. Its totient is φ = 2082000812.

The previous prime is 3123001181. The next prime is 3123001223. The reversal of 3123001221 is 1221003213.

3123001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 3123001221 - 2¹⁹ = 3122476933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3123001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123001223) 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, 520500201 + ... + 520500206.

It is an arithmetic number, because the mean of its divisors is an integer number (1041000408).

Almost surely, 2^3123001221 is an apocalyptic number.

It is an amenable number.

3123001221 is a deficient number, since it is larger than the sum of its proper divisors (1041000411).

3123001221 is a wasteful number, since it uses less digits than its factorization.

3123001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041000410.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 3123001221 is about 55883.8189550428. The cubic root of 3123001221 is about 1461.6970978130.

Adding to 3123001221 its reverse (1221003213), we get a palindrome (4344004434).

The spelling of 3123001221 in words is "three billion, one hundred twenty-three million, one thousand, two hundred twenty-one".