12211031 has 4 divisors (see below), whose sum is σ = 13955472. Its totient is φ = 10466592.

The previous prime is 12211021. The next prime is 12211057. The reversal of 12211031 is 13011221.

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

It is a cyclic number.

It is not a de Polignac number, because 12211031 - 2¹⁰ = 12210007 is a prime.

It is a super-2 number, since 2×12211031² = 298218556165922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211021) 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, 872210 + ... + 872223.

It is an arithmetic number, because the mean of its divisors is an integer number (3488868).

Almost surely, 2^12211031 is an apocalyptic number.

12211031 is a deficient number, since it is larger than the sum of its proper divisors (1744441).

12211031 is an equidigital number, since it uses as much as digits as its factorization.

12211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744440.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12211031 is about 3494.4285655884. The cubic root of 12211031 is about 230.2771140020.

Adding to 12211031 its reverse (13011221), we get a palindrome (25222252).

The spelling of 12211031 in words is "twelve million, two hundred eleven thousand, thirty-one".