11611140021 has 64 divisors (see below), whose sum is σ = 18700281600. Its totient is φ = 7078088448.

The previous prime is 11611140011. The next prime is 11611140041. The reversal of 11611140021 is 12004111611.

11611140021 is a `hidden beast` number, since 11 + 611 + 1 + 40 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 11611140021 - 2³⁰ = 10537398197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11611139976 and 11611140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11611140011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29848495 + ... + 29848883.

It is an arithmetic number, because the mean of its divisors is an integer number (292191900).

Almost surely, 2^11611140021 is an apocalyptic number.

It is an amenable number.

11611140021 is a deficient number, since it is larger than the sum of its proper divisors (7089141579).

11611140021 is a wasteful number, since it uses less digits than its factorization.

11611140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 11611140021 its reverse (12004111611), we get a palindrome (23615251632).

The spelling of 11611140021 in words is "eleven billion, six hundred eleven million, one hundred forty thousand, twenty-one".