2311221 has 12 divisors (see below), whose sum is σ = 3387776. Its totient is φ = 1400520.

The previous prime is 2311193. The next prime is 2311223. The reversal of 2311221 is 1221132.

It is not a de Polignac number, because 2311221 - 2¹³ = 2303029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2311197 and 2311206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2821 + ... + 3546.

2^2311221 is an apocalyptic number.

It is an amenable number.

2311221 is a deficient number, since it is larger than the sum of its proper divisors (1076555).

2311221 is a wasteful number, since it uses less digits than its factorization.

2311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392 (or 6381 counting only the distinct ones).

The product of its digits is 24, while the sum is 12.

The square root of 2311221 is about 1520.2700418018. The cubic root of 2311221 is about 132.2149276341.

Adding to 2311221 its reverse (1221132), we get a palindrome (3532353).

The spelling of 2311221 in words is "two million, three hundred eleven thousand, two hundred twenty-one".