12221320031 has 4 divisors (see below), whose sum is σ = 12246415632. Its totient is φ = 12196224432.

The previous prime is 12221320021. The next prime is 12221320073. The reversal of 12221320031 is 13002312221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13002312221 = 98717 ⋅131713.

It is a cyclic number.

It is not a de Polignac number, because 12221320031 - 2²² = 12217125727 is a prime.

It is a super-2 number, since 2×12221320031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221319991 and 12221320009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221320021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12547070 + ... + 12548043.

It is an arithmetic number, because the mean of its divisors is an integer number (3061603908).

Almost surely, 2^12221320031 is an apocalyptic number.

12221320031 is a deficient number, since it is larger than the sum of its proper divisors (25095601).

12221320031 is an equidigital number, since it uses as much as digits as its factorization.

12221320031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25095600.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12221320031 its reverse (13002312221), we get a palindrome (25223632252).

The spelling of 12221320031 in words is "twelve billion, two hundred twenty-one million, three hundred twenty thousand, thirty-one".