221429933 has 4 divisors (see below), whose sum is σ = 233084160. Its totient is φ = 209775708.

The previous prime is 221429921. The next prime is 221429959. The reversal of 221429933 is 339924122.

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 an emirpimes, since its reverse is a distinct semiprime: 339924122 = 2 ⋅169962061.

It is a cyclic number.

It is not a de Polignac number, because 221429933 - 2²⁴ = 204652717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221429893 and 221429902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221429963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5827085 + ... + 5827122.

It is an arithmetic number, because the mean of its divisors is an integer number (58271040).

Almost surely, 2^221429933 is an apocalyptic number.

It is an amenable number.

221429933 is a deficient number, since it is larger than the sum of its proper divisors (11654227).

221429933 is a wasteful number, since it uses less digits than its factorization.

221429933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11654226.

The product of its digits is 23328, while the sum is 35.

The square root of 221429933 is about 14880.5219330506. The cubic root of 221429933 is about 604.9861645631.

The spelling of 221429933 in words is "two hundred twenty-one million, four hundred twenty-nine thousand, nine hundred thirty-three".