213335421 has 16 divisors (see below), whose sum is σ = 306848640. Its totient is φ = 131060160.

The previous prime is 213335417. The next prime is 213335453. The reversal of 213335421 is 124533312.

It is not a de Polignac number, because 213335421 - 2² = 213335417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213335391 and 213335400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213335411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20275 + ... + 28943.

It is an arithmetic number, because the mean of its divisors is an integer number (19178040).

Almost surely, 2^213335421 is an apocalyptic number.

It is an amenable number.

213335421 is a deficient number, since it is larger than the sum of its proper divisors (93513219).

213335421 is a wasteful number, since it uses less digits than its factorization.

213335421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316.

The product of its digits is 2160, while the sum is 24.

The square root of 213335421 is about 14606.0063330125. The cubic root of 213335421 is about 597.5225819678.

Adding to 213335421 its reverse (124533312), we get a palindrome (337868733).

The spelling of 213335421 in words is "two hundred thirteen million, three hundred thirty-five thousand, four hundred twenty-one".