21705893241 has 4 divisors (see below), whose sum is σ = 28941190992. Its totient is φ = 14470595492.

The previous prime is 21705893221. The next prime is 21705893273. The reversal of 21705893241 is 14239850712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21705893241 - 2²² = 21701698937 is a prime.

It is a super-2 number, since 2×21705893241² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21705893193 and 21705893202.

It is not an unprimeable number, because it can be changed into a prime (21705893221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3617648871 + ... + 3617648876.

It is an arithmetic number, because the mean of its divisors is an integer number (7235297748).

Almost surely, 2^21705893241 is an apocalyptic number.

It is an amenable number.

21705893241 is a deficient number, since it is larger than the sum of its proper divisors (7235297751).

21705893241 is an equidigital number, since it uses as much as digits as its factorization.

21705893241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7235297750.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 21705893241 in words is "twenty-one billion, seven hundred five million, eight hundred ninety-three thousand, two hundred forty-one".