21465424709 has 8 divisors (see below), whose sum is σ = 21536886720. Its totient is φ = 21394056096.

The previous prime is 21465424703. The next prime is 21465424741. The reversal of 21465424709 is 90742456412.

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 21465424709 - 2⁴ = 21465424693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21465424709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465424703) 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 7 ways as a sum of consecutive naturals, for example, 453104 + ... + 498230.

It is an arithmetic number, because the mean of its divisors is an integer number (2692110840).

Almost surely, 2^21465424709 is an apocalyptic number.

It is an amenable number.

21465424709 is a deficient number, since it is larger than the sum of its proper divisors (71462011).

21465424709 is a wasteful number, since it uses less digits than its factorization.

21465424709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46699.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 21465424709 in words is "twenty-one billion, four hundred sixty-five million, four hundred twenty-four thousand, seven hundred nine".