21611878349711 has 8 divisors (see below), whose sum is σ = 23274388919040. Its totient is φ = 19949376121632.

The previous prime is 21611878349651. The next prime is 21611878349753. The reversal of 21611878349711 is 11794387811612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21611878349711 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 (21611878349911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3940946 + ... + 7665168.

It is an arithmetic number, because the mean of its divisors is an integer number (2909298614880).

Almost surely, 2^{21611878349711} is an apocalyptic number.

21611878349711 is a deficient number, since it is larger than the sum of its proper divisors (1662510569329).

21611878349711 is a wasteful number, since it uses less digits than its factorization.

21611878349711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170625.

The product of its digits is 4064256, while the sum is 59.

The spelling of 21611878349711 in words is "twenty-one trillion, six hundred eleven billion, eight hundred seventy-eight million, three hundred forty-nine thousand, seven hundred eleven".