221423245 has 8 divisors (see below), whose sum is σ = 279692640. Its totient is φ = 167815440.

The previous prime is 221423243. The next prime is 221423263. The reversal of 221423245 is 542324122.

221423245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221423245 - 2¹ = 221423243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221423243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165291 + ... + 1165480.

It is an arithmetic number, because the mean of its divisors is an integer number (34961580).

Almost surely, 2^221423245 is an apocalyptic number.

It is an amenable number.

221423245 is a deficient number, since it is larger than the sum of its proper divisors (58269395).

221423245 is a wasteful number, since it uses less digits than its factorization.

221423245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330795.

The product of its digits is 3840, while the sum is 25.

The square root of 221423245 is about 14880.2972080533. The cubic root of 221423245 is about 604.9800735645.

Adding to 221423245 its reverse (542324122), we get a palindrome (763747367).

The spelling of 221423245 in words is "two hundred twenty-one million, four hundred twenty-three thousand, two hundred forty-five".