21318984427 has 16 divisors (see below), whose sum is σ = 23241603168. Its totient is φ = 19437949440.

The previous prime is 21318984403. The next prime is 21318984469. The reversal of 21318984427 is 72448981312.

It is not a de Polignac number, because 21318984427 - 2²³ = 21310595819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21318984497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405652 + ... + 455182.

It is an arithmetic number, because the mean of its divisors is an integer number (1452600198).

Almost surely, 2^21318984427 is an apocalyptic number.

21318984427 is a deficient number, since it is larger than the sum of its proper divisors (1922618741).

21318984427 is a wasteful number, since it uses less digits than its factorization.

21318984427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49950.

The product of its digits is 774144, while the sum is 49.

The spelling of 21318984427 in words is "twenty-one billion, three hundred eighteen million, nine hundred eighty-four thousand, four hundred twenty-seven".