1221100010003 has 2 divisors, whose sum is σ = 1221100010004. Its totient is φ = 1221100010002.

The previous prime is 1221100009999. The next prime is 1221100010063. The reversal of 1221100010003 is 3000100011221.

It is a weak prime.

It is an emirp because it is prime and its reverse (3000100011221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100010003 - 2² = 1221100009999 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221100010063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550005001 + 610550005002.

It is an arithmetic number, because the mean of its divisors is an integer number (610550005002).

Almost surely, 2^{1221100010003} is an apocalyptic number.

1221100010003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100010003 is an equidigital number, since it uses as much as digits as its factorization.

1221100010003 is an evil number, because the sum of its binary digits is even.

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

Adding to 1221100010003 its reverse (3000100011221), we get a palindrome (4221200021224).

The spelling of 1221100010003 in words is "one trillion, two hundred twenty-one billion, one hundred million, ten thousand, three".