12121543457737 has 12 divisors (see below), whose sum is σ = 14100641001216. Its totient is φ = 10389842783880.

The previous prime is 12121543457719. The next prime is 12121543457773. The reversal of 12121543457737 is 73775434512121.

It is not a de Polignac number, because 12121543457737 - 2⁷ = 12121543457609 is a prime.

It is a super-2 number, since 2×12121543457737² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12121543451737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11943912 + ... + 12918982.

It is an arithmetic number, because the mean of its divisors is an integer number (1175053416768).

Almost surely, 2^{12121543457737} is an apocalyptic number.

It is an amenable number.

12121543457737 is a deficient number, since it is larger than the sum of its proper divisors (1979097543479).

12121543457737 is an equidigital number, since it uses as much as digits as its factorization.

12121543457737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228788 (or 1228781 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 52.

Adding to 12121543457737 its reverse (73775434512121), we get a palindrome (85896977969858).

The spelling of 12121543457737 in words is "twelve trillion, one hundred twenty-one billion, five hundred forty-three million, four hundred fifty-seven thousand, seven hundred thirty-seven".