1221101220003 has 16 divisors (see below), whose sum is σ = 1881632701440. Its totient is φ = 689931988416.

The previous prime is 1221101219999. The next prime is 1221101220011. The reversal of 1221101220003 is 3000221011221.

It is not a de Polignac number, because 1221101220003 - 2² = 1221101219999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221101220403) 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, 326670475 + ... + 326674212.

It is an arithmetic number, because the mean of its divisors is an integer number (117602043840).

Almost surely, 2^{1221101220003} is an apocalyptic number.

1221101220003 is a deficient number, since it is larger than the sum of its proper divisors (660531481437).

1221101220003 is an equidigital number, since it uses as much as digits as its factorization.

1221101220003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653344786.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1221101220003 its reverse (3000221011221), we get a palindrome (4221322231224).

The spelling of 1221101220003 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, three".