1221012002111 has 24 divisors (see below), whose sum is σ = 1355405140992. Its totient is φ = 1090610928000.

The previous prime is 1221012002101. The next prime is 1221012002129. The reversal of 1221012002111 is 1112002101221.

It is not a de Polignac number, because 1221012002111 - 2¹⁰ = 1221012001087 is a prime.

It is a super-2 number, since 2×1221012002111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012002101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118505186 + ... + 118515488.

It is an arithmetic number, because the mean of its divisors is an integer number (56475214208).

Almost surely, 2^{1221012002111} is an apocalyptic number.

1221012002111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221012002111 is a deficient number, since it is larger than the sum of its proper divisors (134393138881).

1221012002111 is an equidigital number, since it uses as much as digits as its factorization.

1221012002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11183 (or 10782 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221012002111 its reverse (1112002101221), we get a palindrome (2333014103332).

It can be divided in two parts, 122101 and 2002111, that added together give a palindrome (2124212).

The spelling of 1221012002111 in words is "one trillion, two hundred twenty-one billion, twelve million, two thousand, one hundred eleven".