21670338371668 has 24 divisors (see below), whose sum is σ = 43341966726912. Its totient is φ = 9287011448544.

The previous prime is 21670338371659. The next prime is 21670338371743. The reversal of 21670338371668 is 86617383307612.

It is a happy 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, 10558771 + ... + 12443002.

It is an arithmetic number, because the mean of its divisors is an integer number (1805915280288).

Almost surely, 2^{21670338371668} is an apocalyptic number.

21670338371668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21670338371668 is an abundant number, since it is smaller than the sum of its proper divisors (21671628355244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21670338371668 is a wasteful number, since it uses less digits than its factorization.

21670338371668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23035431 (or 23035429 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 61.

The spelling of 21670338371668 in words is "twenty-one trillion, six hundred seventy billion, three hundred thirty-eight million, three hundred seventy-one thousand, six hundred sixty-eight".