2312221 has 4 divisors (see below), whose sum is σ = 2448252. Its totient is φ = 2176192.

The previous prime is 2312209. The next prime is 2312249. The reversal of 2312221 is 1222132.

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 1240996 + 1071225 = 1114^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312221 - 2¹⁷ = 2181149 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 (2312201) 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, 67990 + ... + 68023.

It is an arithmetic number, because the mean of its divisors is an integer number (612063).

2^2312221 is an apocalyptic number.

It is an amenable number.

2312221 is a deficient number, since it is larger than the sum of its proper divisors (136031).

2312221 is a wasteful number, since it uses less digits than its factorization.

2312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136030.

The product of its digits is 48, while the sum is 13.

The square root of 2312221 is about 1520.5988951726. The cubic root of 2312221 is about 132.2339934387.

Adding to 2312221 its reverse (1222132), we get a palindrome (3534353).

The spelling of 2312221 in words is "two million, three hundred twelve thousand, two hundred twenty-one".