1221123000203 has 4 divisors (see below), whose sum is σ = 1221735708168. Its totient is φ = 1220510292240.

The previous prime is 1221123000187. The next prime is 1221123000217. The reversal of 1221123000203 is 3020003211221.

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 1221123000203 - 2⁴ = 1221123000187 is a prime.

It is a super-2 number, since 2×1221123000203² (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 (1221123500203) 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, 306350993 + ... + 306354978.

It is an arithmetic number, because the mean of its divisors is an integer number (305433927042).

Almost surely, 2^{1221123000203} is an apocalyptic number.

1221123000203 is a deficient number, since it is larger than the sum of its proper divisors (612707965).

1221123000203 is an equidigital number, since it uses as much as digits as its factorization.

1221123000203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612707964.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1221123000203 its reverse (3020003211221), we get a palindrome (4241126211424).

The spelling of 1221123000203 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-three million, two hundred three", and thus it is an aban number.