1201211221 has 8 divisors (see below), whose sum is σ = 1377500544. Its totient is φ = 1026093840.

The previous prime is 1201211203. The next prime is 1201211269. The reversal of 1201211221 is 1221121021.

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 1201211221 - 2⁵ = 1201211189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201211201) 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, 290785 + ... + 294886.

It is an arithmetic number, because the mean of its divisors is an integer number (172187568).

Almost surely, 2^1201211221 is an apocalyptic number.

It is an amenable number.

1201211221 is a deficient number, since it is larger than the sum of its proper divisors (176289323).

1201211221 is an equidigital number, since it uses as much as digits as its factorization.

1201211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585971.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1201211221 is about 34658.4942113762. The cubic root of 1201211221 is about 1063.0159807291.

Adding to 1201211221 its reverse (1221121021), we get a palindrome (2422332242).

The spelling of 1201211221 in words is "one billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".