11123203021203 has 64 divisors (see below), whose sum is σ = 19261103339520. Its totient is φ = 5549031595008.

The previous prime is 11123203021193. The next prime is 11123203021213. The reversal of 11123203021203 is 30212030232111.

It is an interprime number because it is at equal distance from previous prime (11123203021193) and next prime (11123203021213).

It is not a de Polignac number, because 11123203021203 - 2⁸ = 11123203020947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 11123203021203.

It is not an unprimeable number, because it can be changed into a prime (11123203021213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9393376 + ... + 10511037.

It is an arithmetic number, because the mean of its divisors is an integer number (300954739680).

Almost surely, 2^{11123203021203} is an apocalyptic number.

11123203021203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11123203021203 is a deficient number, since it is larger than the sum of its proper divisors (8137900318317).

11123203021203 is a wasteful number, since it uses less digits than its factorization.

11123203021203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19904548.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 11123203021203 its reverse (30212030232111), we get a palindrome (41335233253314).

The spelling of 11123203021203 in words is "eleven trillion, one hundred twenty-three billion, two hundred three million, twenty-one thousand, two hundred three".