12145021997 has 2 divisors, whose sum is σ = 12145021998. Its totient is φ = 12145021996.

The previous prime is 12145021979. The next prime is 12145022041. The reversal of 12145021997 is 79912054121.

It is a happy number.

Together with previous prime (12145021979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11721526756 + 423495241 = 108266^2 + 20579^2 .

It is an emirp because it is prime and its reverse (79912054121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12145021997 - 2²⁰ = 12143973421 is a prime.

It is a super-2 number, since 2×12145021997² (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 (12145071997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6072510998 + 6072510999.

It is an arithmetic number, because the mean of its divisors is an integer number (6072510999).

Almost surely, 2^12145021997 is an apocalyptic number.

It is an amenable number.

12145021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12145021997 is an equidigital number, since it uses as much as digits as its factorization.

12145021997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 12145021997 in words is "twelve billion, one hundred forty-five million, twenty-one thousand, nine hundred ninety-seven".