21814424537 has 4 divisors (see below), whose sum is σ = 22172038116. Its totient is φ = 21456810960.

The previous prime is 21814424483. The next prime is 21814424539. The reversal of 21814424537 is 73542441812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4908964096 + 16905460441 = 70064^2 + 130021^2 .

It is a cyclic number.

It is not a de Polignac number, because 21814424537 - 2¹⁴ = 21814408153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21814424494 and 21814424503.

It is not an unprimeable number, because it can be changed into a prime (21814424539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178806698 + ... + 178806819.

It is an arithmetic number, because the mean of its divisors is an integer number (5543009529).

Almost surely, 2^21814424537 is an apocalyptic number.

It is an amenable number.

21814424537 is a deficient number, since it is larger than the sum of its proper divisors (357613579).

21814424537 is an equidigital number, since it uses as much as digits as its factorization.

21814424537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357613578.

The product of its digits is 215040, while the sum is 41.

The spelling of 21814424537 in words is "twenty-one billion, eight hundred fourteen million, four hundred twenty-four thousand, five hundred thirty-seven".