222221221001 has 8 divisors (see below), whose sum is σ = 239423332680. Its totient is φ = 205034562432.

The previous prime is 222221220997. The next prime is 222221221043. The reversal of 222221221001 is 100122122222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19879590025 + 202341630976 = 140995^2 + 449824^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 222221221001 - 2² = 222221220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222221221051) 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, 3833396 + ... + 3890933.

It is an arithmetic number, because the mean of its divisors is an integer number (29927916585).

Almost surely, 2^222221221001 is an apocalyptic number.

It is an amenable number.

222221221001 is a deficient number, since it is larger than the sum of its proper divisors (17202111679).

222221221001 is a wasteful number, since it uses less digits than its factorization.

222221221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726555.

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

Adding to 222221221001 its reverse (100122122222), we get a palindrome (322343343223).

The spelling of 222221221001 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, one".