213681133 has 4 divisors (see below), whose sum is σ = 213710400. Its totient is φ = 213651868.

The previous prime is 213681113. The next prime is 213681151. The reversal of 213681133 is 331186312.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 213681133 - 2¹³ = 213672941 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 (213681113) 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, 6318 + ... + 21616.

It is an arithmetic number, because the mean of its divisors is an integer number (53427600).

Almost surely, 2^213681133 is an apocalyptic number.

It is an amenable number.

213681133 is a deficient number, since it is larger than the sum of its proper divisors (29267).

213681133 is a wasteful number, since it uses less digits than its factorization.

213681133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29266.

The product of its digits is 2592, while the sum is 28.

The square root of 213681133 is about 14617.8361257746. The cubic root of 213681133 is about 597.8451713796.

The spelling of 213681133 in words is "two hundred thirteen million, six hundred eighty-one thousand, one hundred thirty-three".