21611236076011 has 4 divisors (see below), whose sum is σ = 21612779860000. Its totient is φ = 21609692292024.

The previous prime is 21611236076009. The next prime is 21611236076033. The reversal of 21611236076011 is 11067063211612.

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

It is a cyclic number.

It is not a de Polignac number, because 21611236076011 - 2¹ = 21611236076009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611236076071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771870996 + ... + 771898993.

It is an arithmetic number, because the mean of its divisors is an integer number (5403194965000).

Almost surely, 2^{21611236076011} is an apocalyptic number.

21611236076011 is a deficient number, since it is larger than the sum of its proper divisors (1543783989).

21611236076011 is a wasteful number, since it uses less digits than its factorization.

21611236076011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543783988.

The product of its (nonzero) digits is 18144, while the sum is 37.

Adding to 21611236076011 its reverse (11067063211612), we get a palindrome (32678299287623).

The spelling of 21611236076011 in words is "twenty-one trillion, six hundred eleven billion, two hundred thirty-six million, seventy-six thousand, eleven".