21798165095 has 16 divisors (see below), whose sum is σ = 29915355648. Its totient is φ = 14936948640.

The previous prime is 21798165079. The next prime is 21798165101. The reversal of 21798165095 is 59056189712.

It is a happy number.

It is not a de Polignac number, because 21798165095 - 2⁴ = 21798165079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164561 + ... + 265850.

It is an arithmetic number, because the mean of its divisors is an integer number (1869709728).

Almost surely, 2^21798165095 is an apocalyptic number.

21798165095 is a deficient number, since it is larger than the sum of its proper divisors (8117190553).

21798165095 is a wasteful number, since it uses less digits than its factorization.

21798165095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431870.

The product of its (nonzero) digits is 1360800, while the sum is 53.

The spelling of 21798165095 in words is "twenty-one billion, seven hundred ninety-eight million, one hundred sixty-five thousand, ninety-five".