1116543021 has 16 divisors (see below), whose sum is σ = 1632486720. Its totient is φ = 673182720.

The previous prime is 1116543019. The next prime is 1116543053. The reversal of 1116543021 is 1203456111.

It is a happy number.

It is not a de Polignac number, because 1116543021 - 2¹ = 1116543019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1116542982 and 1116543000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116543061) 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, 81286 + ... + 94023.

It is an arithmetic number, because the mean of its divisors is an integer number (102030420).

Almost surely, 2^1116543021 is an apocalyptic number.

1116543021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1116543021 is a deficient number, since it is larger than the sum of its proper divisors (515943699).

1116543021 is a wasteful number, since it uses less digits than its factorization.

1116543021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175516.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1116543021 is about 33414.7126427866. The cubic root of 1116543021 is about 1037.4292463677.

Adding to 1116543021 its reverse (1203456111), we get a palindrome (2319999132).

The spelling of 1116543021 in words is "one billion, one hundred sixteen million, five hundred forty-three thousand, twenty-one".