21344308715520 has 672 divisors, whose sum is σ = 84636559687680. Its totient is φ = 4874222960640.

The previous prime is 21344308715497. The next prime is 21344308715531. The reversal of 21344308715520 is 2551780344312.

21344308715520 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 4 + 30 + 87 + 15 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3403649985 + ... + 3403656255.

It is an arithmetic number, because the mean of its divisors is an integer number (125947261440).

Almost surely, 2^{21344308715520} is an apocalyptic number.

21344308715520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21344308715520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42318279843840).

21344308715520 is an abundant number, since it is smaller than the sum of its proper divisors (63292250972160).

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

21344308715520 is a wasteful number, since it uses less digits than its factorization.

21344308715520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7634 (or 7607 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 21344308715520 in words is "twenty-one trillion, three hundred forty-four billion, three hundred eight million, seven hundred fifteen thousand, five hundred twenty".