216109133 has 4 divisors (see below), whose sum is σ = 216597408. Its totient is φ = 215620860.

The previous prime is 216109121. The next prime is 216109147. The reversal of 216109133 is 331901612.

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 216109133 - 2²⁴ = 199331917 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 (216109163) 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, 243473 + ... + 244358.

It is an arithmetic number, because the mean of its divisors is an integer number (54149352).

Almost surely, 2^216109133 is an apocalyptic number.

It is an amenable number.

216109133 is a deficient number, since it is larger than the sum of its proper divisors (488275).

216109133 is an equidigital number, since it uses as much as digits as its factorization.

216109133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488274.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 216109133 is about 14700.6507679082. The cubic root of 216109133 is about 600.1010320607.

The spelling of 216109133 in words is "two hundred sixteen million, one hundred nine thousand, one hundred thirty-three".