213325245421 has 4 divisors (see below), whose sum is σ = 213382764700. Its totient is φ = 213267726144.

The previous prime is 213325245407. The next prime is 213325245437. The reversal of 213325245421 is 124542523312.

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 86795641321 + 126529604100 = 294611^2 + 355710^2 .

It is a cyclic number.

It is not a de Polignac number, because 213325245421 - 2⁷ = 213325245293 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 (213325245451) 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, 28754076 + ... + 28761493.

It is an arithmetic number, because the mean of its divisors is an integer number (53345691175).

Almost surely, 2^213325245421 is an apocalyptic number.

It is an amenable number.

213325245421 is a deficient number, since it is larger than the sum of its proper divisors (57519279).

213325245421 is an equidigital number, since it uses as much as digits as its factorization.

213325245421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57519278.

The product of its digits is 57600, while the sum is 34.

Adding to 213325245421 its reverse (124542523312), we get a palindrome (337867768733).

The spelling of 213325245421 in words is "two hundred thirteen billion, three hundred twenty-five million, two hundred forty-five thousand, four hundred twenty-one".