222684421 has 2 divisors, whose sum is σ = 222684422. Its totient is φ = 222684420.

The previous prime is 222684379. The next prime is 222684431. The reversal of 222684421 is 124486222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197824225 + 24860196 = 14065^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 222684421 - 2¹¹ = 222682373 is a prime.

It is a super-2 number, since 2×222684421² = 99176702712210482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222684431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111342210 + 111342211.

It is an arithmetic number, because the mean of its divisors is an integer number (111342211).

Almost surely, 2^222684421 is an apocalyptic number.

It is an amenable number.

222684421 is a deficient number, since it is larger than the sum of its proper divisors (1).

222684421 is an equidigital number, since it uses as much as digits as its factorization.

222684421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 31.

The square root of 222684421 is about 14922.6144157115. The cubic root of 222684421 is about 606.1265089314.

The spelling of 222684421 in words is "two hundred twenty-two million, six hundred eighty-four thousand, four hundred twenty-one".