21516389695 has 8 divisors (see below), whose sum is σ = 25841875536. Its totient is φ = 17198306496.

The previous prime is 21516389693. The next prime is 21516389723. The reversal of 21516389695 is 59698361512.

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

It is a cyclic number.

It is not a de Polignac number, because 21516389695 - 2¹ = 21516389693 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 (21516389693) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1844262 + ... + 1855891.

It is an arithmetic number, because the mean of its divisors is an integer number (3230234442).

Almost surely, 2^21516389695 is an apocalyptic number.

21516389695 is a deficient number, since it is larger than the sum of its proper divisors (4325485841).

21516389695 is a wasteful number, since it uses less digits than its factorization.

21516389695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701321.

The product of its digits is 3499200, while the sum is 55.

The spelling of 21516389695 in words is "twenty-one billion, five hundred sixteen million, three hundred eighty-nine thousand, six hundred ninety-five".