1221010112211 has 8 divisors (see below), whose sum is σ = 1672013847504. Its totient is φ = 792006559200.

The previous prime is 1221010112191. The next prime is 1221010112239. The reversal of 1221010112211 is 1122110101221.

It is a happy number.

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

It is not a de Polignac number, because 1221010112211 - 2⁷ = 1221010112083 is a prime.

It is a super-2 number, since 2×1221010112211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221010112251) 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, 5500045440 + ... + 5500045661.

It is an arithmetic number, because the mean of its divisors is an integer number (209001730938).

Almost surely, 2^{1221010112211} is an apocalyptic number.

1221010112211 is a deficient number, since it is larger than the sum of its proper divisors (451003735293).

1221010112211 is a wasteful number, since it uses less digits than its factorization.

1221010112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000091141.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221010112211 its reverse (1122110101221), we get a palindrome (2343120213432).

The spelling of 1221010112211 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred twelve thousand, two hundred eleven".