11124340021 has 4 divisors (see below), whose sum is σ = 11127091500. Its totient is φ = 11121588544.

The previous prime is 11124340013. The next prime is 11124340063. The reversal of 11124340021 is 12004342111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2607634225 + 8516705796 = 51065^2 + 92286^2 .

It is a cyclic number.

It is not a de Polignac number, because 11124340021 - 2³ = 11124340013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11524340021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369666 + ... + 1377763.

It is an arithmetic number, because the mean of its divisors is an integer number (2781772875).

Almost surely, 2^11124340021 is an apocalyptic number.

It is an amenable number.

11124340021 is a deficient number, since it is larger than the sum of its proper divisors (2751479).

11124340021 is an equidigital number, since it uses as much as digits as its factorization.

11124340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751478.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11124340021 its reverse (12004342111), we get a palindrome (23128682132).

The spelling of 11124340021 in words is "eleven billion, one hundred twenty-four million, three hundred forty thousand, twenty-one".