1221233213211 has 32 divisors (see below), whose sum is σ = 1833777807360. Its totient is φ = 716212173600.

The previous prime is 1221233213209. The next prime is 1221233213237. The reversal of 1221233213211 is 1123123321221.

It is not a de Polignac number, because 1221233213211 - 2¹ = 1221233213209 is a prime.

It is a super-2 number, since 2×1221233213211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221233213201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16678266 + ... + 16751328.

It is an arithmetic number, because the mean of its divisors is an integer number (57305556480).

Almost surely, 2^{1221233213211} is an apocalyptic number.

1221233213211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221233213211 is a deficient number, since it is larger than the sum of its proper divisors (612544594149).

1221233213211 is a wasteful number, since it uses less digits than its factorization.

1221233213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89447.

The product of its digits is 864, while the sum is 24.

Adding to 1221233213211 its reverse (1123123321221), we get a palindrome (2344356534432).

The spelling of 1221233213211 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-three million, two hundred thirteen thousand, two hundred eleven".