12243834221 has 2 divisors, whose sum is σ = 12243834222. Its totient is φ = 12243834220.

The previous prime is 12243834179. The next prime is 12243834257.

12243834221 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9656992900 + 2586841321 = 98270^2 + 50861^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12243834221 - 2²² = 12239639917 is a prime.

It is a super-2 number, since 2×12243834221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12243834721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6121917110 + 6121917111.

It is an arithmetic number, because the mean of its divisors is an integer number (6121917111).

Almost surely, 2^12243834221 is an apocalyptic number.

It is an amenable number.

12243834221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12243834221 is an equidigital number, since it uses as much as digits as its factorization.

12243834221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 32.

The spelling of 12243834221 in words is "twelve billion, two hundred forty-three million, eight hundred thirty-four thousand, two hundred twenty-one".