222431021 has 4 divisors (see below), whose sum is σ = 222632700. Its totient is φ = 222229344.

The previous prime is 222430979. The next prime is 222431029. The reversal of 222431021 is 120134222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 204061225 = 4286^2 + 14285^2 .

It is a cyclic number.

It is not a de Polignac number, because 222431021 - 2¹⁰ = 222429997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222431029) 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, 99176 + ... + 101393.

It is an arithmetic number, because the mean of its divisors is an integer number (55658175).

Almost surely, 2^222431021 is an apocalyptic number.

It is an amenable number.

222431021 is a deficient number, since it is larger than the sum of its proper divisors (201679).

222431021 is a wasteful number, since it uses less digits than its factorization.

222431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201678.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 222431021 is about 14914.1215296108. The cubic root of 222431021 is about 605.8965111721.

Adding to 222431021 its reverse (120134222), we get a palindrome (342565243).

The spelling of 222431021 in words is "two hundred twenty-two million, four hundred thirty-one thousand, twenty-one".