21597095205 has 192 divisors, whose sum is σ = 47894664960. Its totient is φ = 9288276480.

The previous prime is 21597095167. The next prime is 21597095207. The reversal of 21597095205 is 50259079512.

21597095205 is a `hidden beast` number, since 2 + 1 + 59 + 70 + 9 + 520 + 5 = 666.

It is not a de Polignac number, because 21597095205 - 2⁷ = 21597095077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21597095207) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9107670 + ... + 9110040.

It is an arithmetic number, because the mean of its divisors is an integer number (249451380).

Almost surely, 2^21597095205 is an apocalyptic number.

It is an amenable number.

21597095205 is an abundant number, since it is smaller than the sum of its proper divisors (26297569755).

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

21597095205 is an equidigital number, since it uses as much as digits as its factorization.

21597095205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 45.

The spelling of 21597095205 in words is "twenty-one billion, five hundred ninety-seven million, ninety-five thousand, two hundred five".