21495378395 has 16 divisors (see below), whose sum is σ = 27196861440. Its totient is φ = 16264351584.

The previous prime is 21495378379. The next prime is 21495378397. The reversal of 21495378395 is 59387359412.

It is a cyclic number.

It is not a de Polignac number, because 21495378395 - 2⁴ = 21495378379 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21495378395.

It is not an unprimeable number, because it can be changed into a prime (21495378397) 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 15 ways as a sum of consecutive naturals, for example, 128717 + ... + 244046.

It is an arithmetic number, because the mean of its divisors is an integer number (1699803840).

Almost surely, 2^21495378395 is an apocalyptic number.

21495378395 is a deficient number, since it is larger than the sum of its proper divisors (5701483045).

21495378395 is a wasteful number, since it uses less digits than its factorization.

21495378395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373394.

The product of its digits is 8164800, while the sum is 56.

The spelling of 21495378395 in words is "twenty-one billion, four hundred ninety-five million, three hundred seventy-eight thousand, three hundred ninety-five".