213033421 has 4 divisors (see below), whose sum is σ = 213115392. Its totient is φ = 212951452.

The previous prime is 213033349. The next prime is 213033467. The reversal of 213033421 is 124330312.

213033421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213033421 - 2⁹ = 213032909 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 (213033721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36955 + ... + 42328.

It is an arithmetic number, because the mean of its divisors is an integer number (53278848).

Almost surely, 2^213033421 is an apocalyptic number.

It is an amenable number.

213033421 is a deficient number, since it is larger than the sum of its proper divisors (81971).

213033421 is an equidigital number, since it uses as much as digits as its factorization.

213033421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81970.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 213033421 is about 14595.6644590097. The cubic root of 213033421 is about 597.2404956085.

Adding to 213033421 its reverse (124330312), we get a palindrome (337363733).

The spelling of 213033421 in words is "two hundred thirteen million, thirty-three thousand, four hundred twenty-one".