11111321023 has 16 divisors (see below), whose sum is σ = 12872624544. Its totient is φ = 9478748160.

The previous prime is 11111321017. The next prime is 11111321027. The reversal of 11111321023 is 32012311111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11111321023 - 2⁹ = 11111320511 is a prime.

It is a super-2 number, since 2×11111321023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111320988 and 11111321006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111321027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25140 + ... + 151177.

It is an arithmetic number, because the mean of its divisors is an integer number (804539034).

Almost surely, 2^11111321023 is an apocalyptic number.

11111321023 is a deficient number, since it is larger than the sum of its proper divisors (1761303521).

11111321023 is a wasteful number, since it uses less digits than its factorization.

11111321023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176682.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11111321023 its reverse (32012311111), we get a palindrome (43123632134).

The spelling of 11111321023 in words is "eleven billion, one hundred eleven million, three hundred twenty-one thousand, twenty-three".