21838201318387 has 4 divisors (see below), whose sum is σ = 21952537451136. Its totient is φ = 21723865185640.

The previous prime is 21838201318363. The next prime is 21838201318429. The reversal of 21838201318387 is 78381310283812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21838201318387 - 2⁴³ = 13042108296179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21838201318357) 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, 57168066088 + ... + 57168066469.

It is an arithmetic number, because the mean of its divisors is an integer number (5488134362784).

Almost surely, 2^{21838201318387} is an apocalyptic number.

21838201318387 is a deficient number, since it is larger than the sum of its proper divisors (114336132749).

21838201318387 is a wasteful number, since it uses less digits than its factorization.

21838201318387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114336132748.

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 21838201318387 in words is "twenty-one trillion, eight hundred thirty-eight billion, two hundred one million, three hundred eighteen thousand, three hundred eighty-seven".