1221110012003 has 12 divisors (see below), whose sum is σ = 1414933404048. Its totient is φ = 1032327806400.

The previous prime is 1221110011993. The next prime is 1221110012009. The reversal of 1221110012003 is 3002100111221.

It is not a de Polignac number, because 1221110012003 - 2¹⁴ = 1221109995619 is a prime.

It is a super-2 number, since 2×1221110012003² (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 (1221110012009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16330148 + ... + 16404753.

It is an arithmetic number, because the mean of its divisors is an integer number (117911117004).

Almost surely, 2^{1221110012003} is an apocalyptic number.

1221110012003 is a deficient number, since it is larger than the sum of its proper divisors (193823392045).

1221110012003 is an frugal number, since it uses more digits than its factorization.

1221110012003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32735054 (or 32734981 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221110012003 its reverse (3002100111221), we get a palindrome (4223210123224).

The spelling of 1221110012003 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, twelve thousand, three".