222121033221 has 16 divisors (see below), whose sum is σ = 309144692736. Its totient is φ = 141593478576.

The previous prime is 222121033213. The next prime is 222121033231. The reversal of 222121033221 is 122330121222.

It is not a de Polignac number, because 222121033221 - 2³ = 222121033213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121033231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354145 + ... + 754758.

It is an arithmetic number, because the mean of its divisors is an integer number (19321543296).

Almost surely, 2^222121033221 is an apocalyptic number.

It is an amenable number.

222121033221 is a deficient number, since it is larger than the sum of its proper divisors (87023659515).

222121033221 is a wasteful number, since it uses less digits than its factorization.

222121033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111832.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 222121033221 its reverse (122330121222), we get a palindrome (344451154443).

The spelling of 222121033221 in words is "two hundred twenty-two billion, one hundred twenty-one million, thirty-three thousand, two hundred twenty-one".