21670740347117 has 4 divisors (see below), whose sum is σ = 21670755072480. Its totient is φ = 21670725621756.

The previous prime is 21670740347083. The next prime is 21670740347147. The reversal of 21670740347117 is 71174304707612.

It is a happy number.

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 21670740347117 - 2²⁸ = 21670471911661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670740347147) 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, 4875017 + ... + 8191902.

It is an arithmetic number, because the mean of its divisors is an integer number (5417688768120).

Almost surely, 2^{21670740347117} is an apocalyptic number.

It is an amenable number.

21670740347117 is a deficient number, since it is larger than the sum of its proper divisors (14725363).

21670740347117 is a wasteful number, since it uses less digits than its factorization.

21670740347117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14725362.

The product of its (nonzero) digits is 1382976, while the sum is 50.

The spelling of 21670740347117 in words is "twenty-one trillion, six hundred seventy billion, seven hundred forty million, three hundred forty-seven thousand, one hundred seventeen".