222221001221 has 8 divisors (see below), whose sum is σ = 223831238400. Its totient is φ = 220610928960.

The previous prime is 222221001193. The next prime is 222221001367. The reversal of 222221001221 is 122100122222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221001221 is a prime.

It is a super-3 number, since 3×222221001221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222221001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221001521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4337885 + ... + 4388813.

It is an arithmetic number, because the mean of its divisors is an integer number (27978904800).

Almost surely, 2^222221001221 is an apocalyptic number.

It is an amenable number.

222221001221 is a deficient number, since it is larger than the sum of its proper divisors (1610237179).

222221001221 is a wasteful number, since it uses less digits than its factorization.

222221001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82459.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222221001221 its reverse (122100122222), we get a palindrome (344321123443).

The spelling of 222221001221 in words is "two hundred twenty-two billion, two hundred twenty-one million, one thousand, two hundred twenty-one".