11111201023 has 16 divisors (see below), whose sum is σ = 12266898336. Its totient is φ = 9998876160.

The previous prime is 11111201011. The next prime is 11111201033. The reversal of 11111201023 is 32010211111.

It is a happy number.

It is not a de Polignac number, because 11111201023 - 2²¹ = 11109103871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111200994 and 11111201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111201033) 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, 783411 + ... + 797467.

It is an arithmetic number, because the mean of its divisors is an integer number (766681146).

Almost surely, 2^11111201023 is an apocalyptic number.

11111201023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11111201023 is a deficient number, since it is larger than the sum of its proper divisors (1155697313).

11111201023 is a wasteful number, since it uses less digits than its factorization.

11111201023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15594.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11111201023 its reverse (32010211111), we get a palindrome (43121412134).

The spelling of 11111201023 in words is "eleven billion, one hundred eleven million, two hundred one thousand, twenty-three".