21867762248639 has 4 divisors (see below), whose sum is σ = 21867772011360. Its totient is φ = 21867752485920.

The previous prime is 21867762248627. The next prime is 21867762248687. The reversal of 21867762248639 is 93684226776812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21867762248639 - 2¹⁶ = 21867762183103 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 (21867762248699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340727 + ... + 6622055.

It is an arithmetic number, because the mean of its divisors is an integer number (5466943002840).

Almost surely, 2^{21867762248639} is an apocalyptic number.

21867762248639 is a deficient number, since it is larger than the sum of its proper divisors (9762721).

21867762248639 is an equidigital number, since it uses as much as digits as its factorization.

21867762248639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9762720.

The product of its digits is 585252864, while the sum is 71.

The spelling of 21867762248639 in words is "twenty-one trillion, eight hundred sixty-seven billion, seven hundred sixty-two million, two hundred forty-eight thousand, six hundred thirty-nine".