21382167434187 has 24 divisors (see below), whose sum is σ = 33349452840000. Its totient is φ = 12150122262096.

The previous prime is 21382167434137. The next prime is 21382167434189. The reversal of 21382167434187 is 78143476128312.

It is not a de Polignac number, because 21382167434187 - 2⁸ = 21382167433931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21382167434189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406277937 + ... + 406330562.

It is an arithmetic number, because the mean of its divisors is an integer number (1389560535000).

Almost surely, 2^{21382167434187} is an apocalyptic number.

21382167434187 is a deficient number, since it is larger than the sum of its proper divisors (11967285405813).

21382167434187 is a wasteful number, since it uses less digits than its factorization.

21382167434187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812608695 (or 812608688 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 57.

The spelling of 21382167434187 in words is "twenty-one trillion, three hundred eighty-two billion, one hundred sixty-seven million, four hundred thirty-four thousand, one hundred eighty-seven".