222123021 has 16 divisors (see below), whose sum is σ = 302153280. Its totient is φ = 145105920.

The previous prime is 222123001. The next prime is 222123043. The reversal of 222123021 is 120321222.

It is a happy number.

222123021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222123021 - 2¹³ = 222114829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222123001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49645 + ... + 53933.

It is an arithmetic number, because the mean of its divisors is an integer number (18884580).

Almost surely, 2^222123021 is an apocalyptic number.

It is an amenable number.

222123021 is a deficient number, since it is larger than the sum of its proper divisors (80030259).

222123021 is a wasteful number, since it uses less digits than its factorization.

222123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 222123021 is about 14903.7921684382. The cubic root of 222123021 is about 605.6167205706.

Adding to 222123021 its reverse (120321222), we get a palindrome (342444243).

The spelling of 222123021 in words is "two hundred twenty-two million, one hundred twenty-three thousand, twenty-one".