221429893 has 4 divisors (see below), whose sum is σ = 221514400. Its totient is φ = 221345388.

The previous prime is 221429863. The next prime is 221429899. The reversal of 221429893 is 398924122.

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 221429893 - 2⁵ = 221429861 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 (221429899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38193 + ... + 43606.

It is an arithmetic number, because the mean of its divisors is an integer number (55378600).

Almost surely, 2^221429893 is an apocalyptic number.

It is an amenable number.

221429893 is a deficient number, since it is larger than the sum of its proper divisors (84507).

221429893 is an equidigital number, since it uses as much as digits as its factorization.

221429893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84506.

The product of its digits is 62208, while the sum is 40.

The square root of 221429893 is about 14880.5205890117. The cubic root of 221429893 is about 604.9861281340.

The spelling of 221429893 in words is "two hundred twenty-one million, four hundred twenty-nine thousand, eight hundred ninety-three".