4311221 has 2 divisors, whose sum is σ = 4311222. Its totient is φ = 4311220.

The previous prime is 4311211. The next prime is 4311247. The reversal of 4311221 is 1221134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4056196 + 255025 = 2014^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 4311221 - 2¹⁴ = 4294837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4311196 and 4311205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4311211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2155610 + 2155611.

It is an arithmetic number, because the mean of its divisors is an integer number (2155611).

Almost surely, 2^4311221 is an apocalyptic number.

It is an amenable number.

4311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4311221 is an equidigital number, since it uses as much as digits as its factorization.

4311221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 14.

The square root of 4311221 is about 2076.3479958812. The cubic root of 4311221 is about 162.7546586963.

Adding to 4311221 its reverse (1221134), we get a palindrome (5532355).

The spelling of 4311221 in words is "four million, three hundred eleven thousand, two hundred twenty-one".