1201222221 has 8 divisors (see below), whose sum is σ = 1604012160. Its totient is φ = 799623552.

The previous prime is 1201222207. The next prime is 1201222259. The reversal of 1201222221 is 1222221021.

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

It is not a de Polignac number, because 1201222221 - 2⁷ = 1201222093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201222271) 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, 295461 + ... + 299498.

It is an arithmetic number, because the mean of its divisors is an integer number (200501520).

Almost surely, 2^1201222221 is an apocalyptic number.

It is an amenable number.

1201222221 is a deficient number, since it is larger than the sum of its proper divisors (402789939).

1201222221 is an equidigital number, since it uses as much as digits as its factorization.

1201222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595635.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1201222221 is about 34658.6529022696. The cubic root of 1201222221 is about 1063.0192255484.

Adding to 1201222221 its reverse (1222221021), we get a palindrome (2423443242).

The spelling of 1201222221 in words is "one billion, two hundred one million, two hundred twenty-two thousand, two hundred twenty-one".