222121331 has 4 divisors (see below), whose sum is σ = 222487872. Its totient is φ = 221754792.

The previous prime is 222121309. The next prime is 222121351. The reversal of 222121331 is 133121222.

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

It is a cyclic number.

It is not a de Polignac number, because 222121331 - 2¹⁰ = 222120307 is a prime.

It is a super-2 number, since 2×222121331² = 98675771370423122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182360 + ... + 183573.

It is an arithmetic number, because the mean of its divisors is an integer number (55621968).

Almost surely, 2^222121331 is an apocalyptic number.

222121331 is a deficient number, since it is larger than the sum of its proper divisors (366541).

222121331 is an equidigital number, since it uses as much as digits as its factorization.

222121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366540.

The product of its digits is 144, while the sum is 17.

The square root of 222121331 is about 14903.7354713508. The cubic root of 222121331 is about 605.6151846427.

Adding to 222121331 its reverse (133121222), we get a palindrome (355242553).

The spelling of 222121331 in words is "two hundred twenty-two million, one hundred twenty-one thousand, three hundred thirty-one".