21695312077805 has 8 divisors (see below), whose sum is σ = 26157760155744. Its totient is φ = 17273992554000.

The previous prime is 21695312077763. The next prime is 21695312077861. The reversal of 21695312077805 is 50877021359612.

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

It is not a de Polignac number, because 21695312077805 - 2²⁴ = 21695295300589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10282137371 + ... + 10282139480.

It is an arithmetic number, because the mean of its divisors is an integer number (3269720019468).

Almost surely, 2^{21695312077805} is an apocalyptic number.

It is an amenable number.

21695312077805 is a deficient number, since it is larger than the sum of its proper divisors (4462448077939).

21695312077805 is a wasteful number, since it uses less digits than its factorization.

21695312077805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20564277067.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 21695312077805 in words is "twenty-one trillion, six hundred ninety-five billion, three hundred twelve million, seventy-seven thousand, eight hundred five".