212023303421 has 4 divisors (see below), whose sum is σ = 212078622492. Its totient is φ = 211967984352.

The previous prime is 212023303417. The next prime is 212023303423. The reversal of 212023303421 is 124303320212.

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 38310232900 + 173713070521 = 195730^2 + 416789^2 .

It is a cyclic number.

It is not a de Polignac number, because 212023303421 - 2² = 212023303417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212023303423) 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, 27653786 + ... + 27661451.

It is an arithmetic number, because the mean of its divisors is an integer number (53019655623).

Almost surely, 2^212023303421 is an apocalyptic number.

It is an amenable number.

212023303421 is a deficient number, since it is larger than the sum of its proper divisors (55319071).

212023303421 is an equidigital number, since it uses as much as digits as its factorization.

212023303421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55319070.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 212023303421 its reverse (124303320212), we get a palindrome (336326623633).

The spelling of 212023303421 in words is "two hundred twelve billion, twenty-three million, three hundred three thousand, four hundred twenty-one".