221423293 has 12 divisors (see below), whose sum is σ = 274019808. Its totient is φ = 175191120.

The previous prime is 221423287. The next prime is 221423327. The reversal of 221423293 is 392324122.

It is not a de Polignac number, because 221423293 - 2²⁵ = 187868861 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 (221423203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92403 + ... + 94768.

It is an arithmetic number, because the mean of its divisors is an integer number (22834984).

Almost surely, 2^221423293 is an apocalyptic number.

It is an amenable number.

221423293 is a deficient number, since it is larger than the sum of its proper divisors (52596515).

221423293 is a wasteful number, since it uses less digits than its factorization.

221423293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187204 (or 187191 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 221423293 is about 14880.2988209243. The cubic root of 221423293 is about 604.9801172802.

The spelling of 221423293 in words is "two hundred twenty-one million, four hundred twenty-three thousand, two hundred ninety-three".