1221102003 has 32 divisors (see below), whose sum is σ = 1823956992. Its totient is φ = 720266400.

The previous prime is 1221101963. The next prime is 1221102007. The reversal of 1221102003 is 3002011221.

It is a de Polignac number, because none of the positive numbers 2^k-1221102003 is a prime.

It is a super-2 number, since 2×1221102003² = 2982180203461224018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221102003.

It is not an unprimeable number, because it can be changed into a prime (1221102007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439926 + ... + 442692.

It is an arithmetic number, because the mean of its divisors is an integer number (56998656).

Almost surely, 2^1221102003 is an apocalyptic number.

1221102003 is a deficient number, since it is larger than the sum of its proper divisors (602854989).

1221102003 is a wasteful number, since it uses less digits than its factorization.

1221102003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1221102003 is about 34944.2699594655. The cubic root of 1221102003 is about 1068.8513609142.

Adding to 1221102003 its reverse (3002011221), we get a palindrome (4223113224).

The spelling of 1221102003 in words is "one billion, two hundred twenty-one million, one hundred two thousand, three".