21895695306 has 48 divisors (see below), whose sum is σ = 49389447744. Its totient is φ = 7270124544.

The previous prime is 21895695301. The next prime is 21895695307. The reversal of 21895695306 is 60359659812.

It is a happy number.

21895695306 is a `hidden beast` number, since 2 + 18 + 95 + 6 + 9 + 530 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21895695301) 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 23 ways as a sum of consecutive naturals, for example, 37251 + ... + 212553.

It is an arithmetic number, because the mean of its divisors is an integer number (1028946828).

Almost surely, 2^21895695306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21895695306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24694723872).

21895695306 is an abundant number, since it is smaller than the sum of its proper divisors (27493752438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21895695306 is a wasteful number, since it uses less digits than its factorization.

21895695306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175577 (or 175565 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 21895695306 in words is "twenty-one billion, eight hundred ninety-five million, six hundred ninety-five thousand, three hundred six".