21724087435 has 4 divisors (see below), whose sum is σ = 26068904928. Its totient is φ = 17379269944.

The previous prime is 21724087433. The next prime is 21724087453. The reversal of 21724087435 is 53478042712.

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 21724087435 - 2¹ = 21724087433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21724087391 and 21724087400.

It is not an unprimeable number, because it can be changed into a prime (21724087433) 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, 2172408739 + ... + 2172408748.

It is an arithmetic number, because the mean of its divisors is an integer number (6517226232).

Almost surely, 2^21724087435 is an apocalyptic number.

21724087435 is a deficient number, since it is larger than the sum of its proper divisors (4344817493).

21724087435 is an equidigital number, since it uses as much as digits as its factorization.

21724087435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344817492.

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 21724087435 in words is "twenty-one billion, seven hundred twenty-four million, eighty-seven thousand, four hundred thirty-five".