12040221517 has 2 divisors, whose sum is σ = 12040221518. Its totient is φ = 12040221516.

The previous prime is 12040221497. The next prime is 12040221547. The reversal of 12040221517 is 71512204021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11205069316 + 835152201 = 105854^2 + 28899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12040221517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12040221491 and 12040221500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12040221547) 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 as a sum of consecutive naturals, namely, 6020110758 + 6020110759.

It is an arithmetic number, because the mean of its divisors is an integer number (6020110759).

Almost surely, 2^12040221517 is an apocalyptic number.

It is an amenable number.

12040221517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12040221517 is an equidigital number, since it uses as much as digits as its factorization.

12040221517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 12040221517 its reverse (71512204021), we get a palindrome (83552425538).

The spelling of 12040221517 in words is "twelve billion, forty million, two hundred twenty-one thousand, five hundred seventeen".