213033021 has 4 divisors (see below), whose sum is σ = 284044032. Its totient is φ = 142022012.

The previous prime is 213033019. The next prime is 213033047. The reversal of 213033021 is 120330312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213033021 - 2¹ = 213033019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213033721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35505501 + ... + 35505506.

It is an arithmetic number, because the mean of its divisors is an integer number (71011008).

Almost surely, 2^213033021 is an apocalyptic number.

It is an amenable number.

213033021 is a deficient number, since it is larger than the sum of its proper divisors (71011011).

213033021 is an equidigital number, since it uses as much as digits as its factorization.

213033021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71011010.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 213033021 is about 14595.6507563041. The cubic root of 213033021 is about 597.2401218074.

Adding to 213033021 its reverse (120330312), we get a palindrome (333363333).

The spelling of 213033021 in words is "two hundred thirteen million, thirty-three thousand, twenty-one".