212321523242251 has 4 divisors (see below), whose sum is σ = 212322373277872. Its totient is φ = 212320673206632.

The previous prime is 212321523242207. The next prime is 212321523242261. The reversal of 212321523242251 is 152242325123212.

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 212321523242251 - 2²¹ = 212321521145099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212321523242251.

It is not an unprimeable number, because it can be changed into a prime (212321523242261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424643031 + ... + 425142736.

It is an arithmetic number, because the mean of its divisors is an integer number (53080593319468).

Almost surely, 2^{212321523242251} is an apocalyptic number.

212321523242251 is a deficient number, since it is larger than the sum of its proper divisors (850035621).

212321523242251 is an equidigital number, since it uses as much as digits as its factorization.

212321523242251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850035620.

The product of its digits is 115200, while the sum is 37.

Adding to 212321523242251 its reverse (152242325123212), we get a palindrome (364563848365463).

The spelling of 212321523242251 in words is "two hundred twelve trillion, three hundred twenty-one billion, five hundred twenty-three million, two hundred forty-two thousand, two hundred fifty-one".