21750727459 has 8 divisors (see below), whose sum is σ = 21884808960. Its totient is φ = 21616691976.

The previous prime is 21750727457. The next prime is 21750727511. The reversal of 21750727459 is 95472705712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21750727459 - 2¹ = 21750727457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21750727457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1827562 + ... + 1839424.

It is an arithmetic number, because the mean of its divisors is an integer number (2735601120).

Almost surely, 2^21750727459 is an apocalyptic number.

21750727459 is a deficient number, since it is larger than the sum of its proper divisors (134081501).

21750727459 is a wasteful number, since it uses less digits than its factorization.

21750727459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23009.

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 21750727459 in words is "twenty-one billion, seven hundred fifty million, seven hundred twenty-seven thousand, four hundred fifty-nine".