21341724516 has 72 divisors (see below), whose sum is σ = 61667627840. Its totient is φ = 6096275136.

The previous prime is 21341724511. The next prime is 21341724529. The reversal of 21341724516 is 61542714312.

21341724516 is a `hidden beast` number, since 2 + 1 + 34 + 172 + 451 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21341724511) 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 23 ways as a sum of consecutive naturals, for example, 1836075 + ... + 1847661.

Almost surely, 2^21341724516 is an apocalyptic number.

It is an amenable number.

21341724516 is an abundant number, since it is smaller than the sum of its proper divisors (40325903324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21341724516 is a wasteful number, since it uses less digits than its factorization.

21341724516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18913 (or 18908 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The spelling of 21341724516 in words is "twenty-one billion, three hundred forty-one million, seven hundred twenty-four thousand, five hundred sixteen".