21611723041715 has 16 divisors (see below), whose sum is σ = 26003767413600. Its totient is φ = 17242932387072.

The previous prime is 21611723041703. The next prime is 21611723041717. The reversal of 21611723041715 is 51714032711612.

It is a cyclic number.

It is not a de Polignac number, because 21611723041715 - 2³⁰ = 21610649299891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21611723041717) 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, 7187609 + ... + 9740901.

It is an arithmetic number, because the mean of its divisors is an integer number (1625235463350).

Almost surely, 2^{21611723041715} is an apocalyptic number.

21611723041715 is a deficient number, since it is larger than the sum of its proper divisors (4392044371885).

21611723041715 is a wasteful number, since it uses less digits than its factorization.

21611723041715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557846.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 21611723041715 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-three million, forty-one thousand, seven hundred fifteen".