12220311 has 4 divisors (see below), whose sum is σ = 16293752. Its totient is φ = 8146872.

The previous prime is 12220301. The next prime is 12220333. The reversal of 12220311 is 11302221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12220311 - 2⁷ = 12220183 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 (12220301) 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, 2036716 + ... + 2036721.

It is an arithmetic number, because the mean of its divisors is an integer number (4073438).

Almost surely, 2^12220311 is an apocalyptic number.

12220311 is a deficient number, since it is larger than the sum of its proper divisors (4073441).

12220311 is an equidigital number, since it uses as much as digits as its factorization.

12220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073440.

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

The square root of 12220311 is about 3495.7561413806. The cubic root of 12220311 is about 230.3354336886.

Adding to 12220311 its reverse (11302221), we get a palindrome (23522532).

The spelling of 12220311 in words is "twelve million, two hundred twenty thousand, three hundred eleven".