221992423 has 4 divisors (see below), whose sum is σ = 222131160. Its totient is φ = 221853688.

The previous prime is 221992417. The next prime is 221992427. The reversal of 221992423 is 324299122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221992423 - 2⁵ = 221992391 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 (221992427) 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, 66940 + ... + 70177.

It is an arithmetic number, because the mean of its divisors is an integer number (55532790).

Almost surely, 2^221992423 is an apocalyptic number.

221992423 is a deficient number, since it is larger than the sum of its proper divisors (138737).

221992423 is a wasteful number, since it uses less digits than its factorization.

221992423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138736.

The product of its digits is 15552, while the sum is 34.

The square root of 221992423 is about 14899.4101561102. The cubic root of 221992423 is about 605.4980058181.

The spelling of 221992423 in words is "two hundred twenty-one million, nine hundred ninety-two thousand, four hundred twenty-three".