1221111313203 has 8 divisors (see below), whose sum is σ = 1628155475968. Its totient is φ = 814070679624.

The previous prime is 1221111313171. The next prime is 1221111313211. The reversal of 1221111313203 is 3023131111221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221111313203 - 2⁵ = 1221111313171 is a prime.

It is a super-2 number, since 2×1221111313203² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221111313203.

It is not an unprimeable number, because it can be changed into a prime (1221111313223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72726 + ... + 1564452.

It is an arithmetic number, because the mean of its divisors is an integer number (203519434496).

Almost surely, 2^{1221111313203} is an apocalyptic number.

1221111313203 is a deficient number, since it is larger than the sum of its proper divisors (407044162765).

1221111313203 is a wasteful number, since it uses less digits than its factorization.

1221111313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764593.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1221111313203 its reverse (3023131111221), we get a palindrome (4244242424424).

The spelling of 1221111313203 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, three hundred thirteen thousand, two hundred three".