11001321123 has 16 divisors (see below), whose sum is σ = 15832776960. Its totient is φ = 6754611744.

The previous prime is 11001321101. The next prime is 11001321127. The reversal of 11001321123 is 32112310011.

It is a happy number.

It is not a de Polignac number, because 11001321123 - 2⁸ = 11001320867 is a prime.

It is a super-2 number, since 2×11001321123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11001321127) 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, 304161 + ... + 338402.

It is an arithmetic number, because the mean of its divisors is an integer number (989548560).

Almost surely, 2^11001321123 is an apocalyptic number.

11001321123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11001321123 is a deficient number, since it is larger than the sum of its proper divisors (4831455837).

11001321123 is a wasteful number, since it uses less digits than its factorization.

11001321123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643018.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11001321123 its reverse (32112310011), we get a palindrome (43113631134).

The spelling of 11001321123 in words is "eleven billion, one million, three hundred twenty-one thousand, one hundred twenty-three".