222001221 has 32 divisors (see below), whose sum is σ = 341671680. Its totient is φ = 127125504.

The previous prime is 222001201. The next prime is 222001223. The reversal of 222001221 is 122100222.

It is not a de Polignac number, because 222001221 - 2⁷ = 222001093 is a prime.

222001221 is a modest number, since divided by 1221 gives 222 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222001197 and 222001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29845 + ... + 36533.

It is an arithmetic number, because the mean of its divisors is an integer number (10677240).

Almost surely, 2^222001221 is an apocalyptic number.

It is an amenable number.

222001221 is a deficient number, since it is larger than the sum of its proper divisors (119670459).

222001221 is a wasteful number, since it uses less digits than its factorization.

222001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6765.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 222001221 is about 14899.7053997722. The cubic root of 222001221 is about 605.5060047414.

Adding to 222001221 its reverse (122100222), we get a palindrome (344101443).

Subtracting from 222001221 its reverse (122100222), we obtain a palindrome (99900999).

It can be divided in two parts, 222001 and 221, that added together give a palindrome (222222).

The spelling of 222001221 in words is "two hundred twenty-two million, one thousand, two hundred twenty-one".