12221572643351 has 4 divisors (see below), whose sum is σ = 12421926293304. Its totient is φ = 12021218993400.

The previous prime is 12221572643347. The next prime is 12221572643353. The reversal of 12221572643351 is 15334627512221.

It is a happy number.

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 12221572643351 - 2² = 12221572643347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221572643353) 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, 100176824885 + ... + 100176825006.

It is an arithmetic number, because the mean of its divisors is an integer number (3105481573326).

Almost surely, 2^{12221572643351} is an apocalyptic number.

12221572643351 is a deficient number, since it is larger than the sum of its proper divisors (200353649953).

12221572643351 is an equidigital number, since it uses as much as digits as its factorization.

12221572643351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200353649952.

The product of its digits is 604800, while the sum is 44.

The spelling of 12221572643351 in words is "twelve trillion, two hundred twenty-one billion, five hundred seventy-two million, six hundred forty-three thousand, three hundred fifty-one".