1221000020103 has 16 divisors (see below), whose sum is σ = 1653588416000. Its totient is φ = 801268079040.

The previous prime is 1221000020077. The next prime is 1221000020111. The reversal of 1221000020103 is 3010200001221.

It is not a de Polignac number, because 1221000020103 - 2⁸ = 1221000019847 is a prime.

It is a super-3 number, since 3×1221000020103³ (a number of 37 digits) contains 333 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 (1221000020503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7703878 + ... + 7860771.

It is an arithmetic number, because the mean of its divisors is an integer number (103349276000).

Almost surely, 2^{1221000020103} is an apocalyptic number.

1221000020103 is a deficient number, since it is larger than the sum of its proper divisors (432588395897).

1221000020103 is a wasteful number, since it uses less digits than its factorization.

1221000020103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15565062.

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

Adding to 1221000020103 its reverse (3010200001221), we get a palindrome (4231200021324).

The spelling of 1221000020103 in words is "one trillion, two hundred twenty-one billion, twenty thousand, one hundred three".