1221003100001 has 4 divisors (see below), whose sum is σ = 1221032664852. Its totient is φ = 1220973535152.

The previous prime is 1221003099991. The next prime is 1221003100063. The reversal of 1221003100001 is 1000013001221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 682687410001 + 538315690000 = 826249^2 + 733700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221003100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221003100081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14720390 + ... + 14803103.

It is an arithmetic number, because the mean of its divisors is an integer number (305258166213).

Almost surely, 2^{1221003100001} is an apocalyptic number.

It is an amenable number.

1221003100001 is a deficient number, since it is larger than the sum of its proper divisors (29564851).

1221003100001 is an equidigital number, since it uses as much as digits as its factorization.

1221003100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29564850.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 1221003100001 its reverse (1000013001221), we get a palindrome (2221016101222).

The spelling of 1221003100001 in words is "one trillion, two hundred twenty-one billion, three million, one hundred thousand, one".