1211223001211 has 8 divisors (see below), whose sum is σ = 1230549685200. Its totient is φ = 1191970225152.

The previous prime is 1211223001189. The next prime is 1211223001309. The reversal of 1211223001211 is 1121003221121.

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 not a de Polignac number, because 1211223001211 - 2¹⁴ = 1211222984827 is a prime.

It is a super-2 number, since 2×1211223001211² (a number of 25 digits) contains 22 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 1211223001211.

It is not an unprimeable number, because it can be changed into a prime (1211223001511) 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, 18443945 + ... + 18509498.

It is an arithmetic number, because the mean of its divisors is an integer number (153818710650).

Almost surely, 2^{1211223001211} is an apocalyptic number.

1211223001211 is a deficient number, since it is larger than the sum of its proper divisors (19326683989).

1211223001211 is an equidigital number, since it uses as much as digits as its factorization.

1211223001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36953965.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1211223001211 its reverse (1121003221121), we get a palindrome (2332226222332).

The spelling of 1211223001211 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, one thousand, two hundred eleven".