213657433 has 4 divisors (see below), whose sum is σ = 233080848. Its totient is φ = 194234020.

The previous prime is 213657427. The next prime is 213657449. The reversal of 213657433 is 334756312.

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 213657433 - 2¹⁷ = 213526361 is a prime.

It is a super-2 number, since 2×213657433² = 91298997352298978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213657403) 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, 9711691 + ... + 9711712.

It is an arithmetic number, because the mean of its divisors is an integer number (58270212).

Almost surely, 2^213657433 is an apocalyptic number.

It is an amenable number.

213657433 is a deficient number, since it is larger than the sum of its proper divisors (19423415).

213657433 is a wasteful number, since it uses less digits than its factorization.

213657433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19423414.

The product of its digits is 45360, while the sum is 34.

The square root of 213657433 is about 14617.0254497965. The cubic root of 213657433 is about 597.8230676430.

The spelling of 213657433 in words is "two hundred thirteen million, six hundred fifty-seven thousand, four hundred thirty-three".