1221110111203 has 4 divisors (see below), whose sum is σ = 1221126692688. Its totient is φ = 1221093529720.

The previous prime is 1221110111189. The next prime is 1221110111239. The reversal of 1221110111203 is 3021110111221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221110111203 - 2⁵ = 1221110111171 is a prime.

It is a super-2 number, since 2×1221110111203² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221110111303) 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, 8179783 + ... + 8327728.

It is an arithmetic number, because the mean of its divisors is an integer number (305281673172).

Almost surely, 2^{1221110111203} is an apocalyptic number.

1221110111203 is a deficient number, since it is larger than the sum of its proper divisors (16581485).

1221110111203 is an equidigital number, since it uses as much as digits as its factorization.

1221110111203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16581484.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1221110111203 its reverse (3021110111221), we get a palindrome (4242220222424).

The spelling of 1221110111203 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred eleven thousand, two hundred three".