12217812443 has 4 divisors (see below), whose sum is σ = 12228054888. Its totient is φ = 12207570000.

The previous prime is 12217812371. The next prime is 12217812457. The reversal of 12217812443 is 34421871221.

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

It is a cyclic number.

It is not a de Polignac number, because 12217812443 - 2¹² = 12217808347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12217812463) 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, 5119433 + ... + 5121818.

It is an arithmetic number, because the mean of its divisors is an integer number (3057013722).

Almost surely, 2^12217812443 is an apocalyptic number.

12217812443 is a deficient number, since it is larger than the sum of its proper divisors (10242445).

12217812443 is a wasteful number, since it uses less digits than its factorization.

12217812443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10242444.

The product of its digits is 21504, while the sum is 35.

The spelling of 12217812443 in words is "twelve billion, two hundred seventeen million, eight hundred twelve thousand, four hundred forty-three".