18670351670021 has 4 divisors (see below), whose sum is σ = 18684813601344. Its totient is φ = 18655889738700.

The previous prime is 18670351669999. The next prime is 18670351670059. The reversal of 18670351670021 is 12007615307681.

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 a de Polignac number, because none of the positive numbers 2^k-18670351670021 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 (18670351670071) 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, 7230963725 + ... + 7230966306.

It is an arithmetic number, because the mean of its divisors is an integer number (4671203400336).

Almost surely, 2^{18670351670021} is an apocalyptic number.

It is an amenable number.

18670351670021 is a deficient number, since it is larger than the sum of its proper divisors (14461931323).

18670351670021 is a wasteful number, since it uses less digits than its factorization.

18670351670021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14461931322.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 18670351670021 in words is "eighteen trillion, six hundred seventy billion, three hundred fifty-one million, six hundred seventy thousand, twenty-one".