12280721236997 has 4 divisors (see below), whose sum is σ = 12312291214860. Its totient is φ = 12249151259136.

The previous prime is 12280721236967. The next prime is 12280721237033. The reversal of 12280721236997 is 79963212708221.

It is a Cunningham number, because it is equal to 3504386²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2899003401316 + 9381717835681 = 1702646^2 + 3062959^2 .

It is a cyclic number.

It is not a de Polignac number, because 12280721236997 - 2⁶ = 12280721236933 is a prime.

It is a super-2 number, since 2×12280721236997² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12280721236967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15784988348 + ... + 15784989125.

It is an arithmetic number, because the mean of its divisors is an integer number (3078072803715).

Almost surely, 2^{12280721236997} is an apocalyptic number.

It is an amenable number.

12280721236997 is a deficient number, since it is larger than the sum of its proper divisors (31569977863).

12280721236997 is an equidigital number, since it uses as much as digits as its factorization.

12280721236997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31569977862.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 12280721236997 in words is "twelve trillion, two hundred eighty billion, seven hundred twenty-one million, two hundred thirty-six thousand, nine hundred ninety-seven".