12221031 has 4 divisors (see below), whose sum is σ = 16294712. Its totient is φ = 8147352.

The previous prime is 12221029. The next prime is 12221039. The reversal of 12221031 is 13012221.

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

It is not a de Polignac number, because 12221031 - 2¹ = 12221029 is a prime.

It is a super-2 number, since 2×12221031² = 298707197405922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220998 and 12221016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221039) 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, 2036836 + ... + 2036841.

It is an arithmetic number, because the mean of its divisors is an integer number (4073678).

Almost surely, 2^12221031 is an apocalyptic number.

12221031 is a deficient number, since it is larger than the sum of its proper divisors (4073681).

12221031 is an equidigital number, since it uses as much as digits as its factorization.

12221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073680.

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

The square root of 12221031 is about 3495.8591218755. The cubic root of 12221031 is about 230.3399572575.

Adding to 12221031 its reverse (13012221), we get a palindrome (25233252).

The spelling of 12221031 in words is "twelve million, two hundred twenty-one thousand, thirty-one".