216994133 has 4 divisors (see below), whose sum is σ = 217033728. Its totient is φ = 216954540.

The previous prime is 216994123. The next prime is 216994139. The reversal of 216994133 is 331499612.

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 216994133 - 2²⁰ = 215945557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216994139) 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, 9941 + ... + 23082.

It is an arithmetic number, because the mean of its divisors is an integer number (54258432).

Almost surely, 2^216994133 is an apocalyptic number.

It is an amenable number.

216994133 is a deficient number, since it is larger than the sum of its proper divisors (39595).

216994133 is an equidigital number, since it uses as much as digits as its factorization.

216994133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39594.

The product of its digits is 34992, while the sum is 38.

The square root of 216994133 is about 14730.7207223544. The cubic root of 216994133 is about 600.9190849378.

The spelling of 216994133 in words is "two hundred sixteen million, nine hundred ninety-four thousand, one hundred thirty-three".