21705552035 has 4 divisors (see below), whose sum is σ = 26046662448. Its totient is φ = 17364441624.

The previous prime is 21705551963. The next prime is 21705552061. The reversal of 21705552035 is 53025550712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21705552035 - 2²² = 21701357731 is a prime.

It is a super-2 number, since 2×21705552035² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21705551986 and 21705552004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2170555199 + ... + 2170555208.

It is an arithmetic number, because the mean of its divisors is an integer number (6511665612).

Almost surely, 2^21705552035 is an apocalyptic number.

21705552035 is a deficient number, since it is larger than the sum of its proper divisors (4341110413).

21705552035 is an equidigital number, since it uses as much as digits as its factorization.

21705552035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4341110412.

The product of its (nonzero) digits is 52500, while the sum is 35.

The spelling of 21705552035 in words is "twenty-one billion, seven hundred five million, five hundred fifty-two thousand, thirty-five".