12420211189823 has 4 divisors (see below), whose sum is σ = 12420218238288. Its totient is φ = 12420204141360.

The previous prime is 12420211189783. The next prime is 12420211189831. The reversal of 12420211189823 is 32898111202421.

It is a Cunningham number, because it is equal to 3524232²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12420211189823 - 2¹² = 12420211185727 is a prime.

It is a super-2 number, since 2×12420211189823² (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 (12420211189853) 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, 1762115 + ... + 5286347.

It is an arithmetic number, because the mean of its divisors is an integer number (3105054559572).

Almost surely, 2^{12420211189823} is an apocalyptic number.

12420211189823 is a deficient number, since it is larger than the sum of its proper divisors (7048465).

12420211189823 is an equidigital number, since it uses as much as digits as its factorization.

12420211189823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048464.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 12420211189823 in words is "twelve trillion, four hundred twenty billion, two hundred eleven million, one hundred eighty-nine thousand, eight hundred twenty-three".