1221110211211 has 8 divisors (see below), whose sum is σ = 1345309540848. Its totient is φ = 1099109100000.

The previous prime is 1221110211173. The next prime is 1221110211239. The reversal of 1221110211211 is 1121120111221.

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 1221110211211 - 2⁹ = 1221110210699 is a prime.

It is a super-2 number, since 2×1221110211211² (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 (1221110211511) 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, 549553440 + ... + 549555661.

It is an arithmetic number, because the mean of its divisors is an integer number (168163692606).

Almost surely, 2^{1221110211211} is an apocalyptic number.

1221110211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221110211211 is a deficient number, since it is larger than the sum of its proper divisors (124199329637).

1221110211211 is a wasteful number, since it uses less digits than its factorization.

1221110211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099109213.

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

Adding to 1221110211211 its reverse (1121120111221), we get a palindrome (2342230322432).

The spelling of 1221110211211 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two hundred eleven thousand, two hundred eleven".