213033431 has 4 divisors (see below), whose sum is σ = 229420632. Its totient is φ = 196646232.

The previous prime is 213033349. The next prime is 213033467. The reversal of 213033431 is 134330312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213033431 is a prime.

It is a super-2 number, since 2×213033431² = 90766485447263522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213033131) 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, 8193581 + ... + 8193606.

It is an arithmetic number, because the mean of its divisors is an integer number (57355158).

Almost surely, 2^213033431 is an apocalyptic number.

213033431 is a deficient number, since it is larger than the sum of its proper divisors (16387201).

213033431 is a wasteful number, since it uses less digits than its factorization.

213033431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16387200.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 213033431 is about 14595.6648015772. The cubic root of 213033431 is about 597.2405049535.

Adding to 213033431 its reverse (134330312), we get a palindrome (347363743).

The spelling of 213033431 in words is "two hundred thirteen million, thirty-three thousand, four hundred thirty-one".