1221211200211 has 8 divisors (see below), whose sum is σ = 1233544712400. Its totient is φ = 1208898228960.

The previous prime is 1221211200203. The next prime is 1221211200233. The reversal of 1221211200211 is 1120021121221.

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

It is not a de Polignac number, because 1221211200211 - 2³ = 1221211200203 is a prime.

It is a super-2 number, since 2×1221211200211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221211200241) 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, 5015716 + ... + 5253553.

It is an arithmetic number, because the mean of its divisors is an integer number (154193089050).

Almost surely, 2^{1221211200211} is an apocalyptic number.

1221211200211 is a deficient number, since it is larger than the sum of its proper divisors (12333512189).

1221211200211 is a wasteful number, since it uses less digits than its factorization.

1221211200211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270469.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221211200211 its reverse (1120021121221), we get a palindrome (2341232321432).

The spelling of 1221211200211 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred thousand, two hundred eleven".