21788142379 has 4 divisors (see below), whose sum is σ = 21789326160. Its totient is φ = 21786958600.

The previous prime is 21788142377. The next prime is 21788142401. The reversal of 21788142379 is 97324188712.

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 21788142379 - 2¹ = 21788142377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21788142377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563839 + ... + 601240.

It is an arithmetic number, because the mean of its divisors is an integer number (5447331540).

Almost surely, 2^21788142379 is an apocalyptic number.

21788142379 is a deficient number, since it is larger than the sum of its proper divisors (1183781).

21788142379 is a wasteful number, since it uses less digits than its factorization.

21788142379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183780.

The product of its digits is 1354752, while the sum is 52.

The spelling of 21788142379 in words is "twenty-one billion, seven hundred eighty-eight million, one hundred forty-two thousand, three hundred seventy-nine".