21247734860384 has 48 divisors (see below), whose sum is σ = 42340040064000. Its totient is φ = 10495261966464.

The previous prime is 21247734860377. The next prime is 21247734860389. The reversal of 21247734860384 is 48306843774212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21247734860389) 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, 7413584 + ... + 9872015.

It is an arithmetic number, because the mean of its divisors is an integer number (882084168000).

Almost surely, 2^{21247734860384} is an apocalyptic number.

It is an amenable number.

21247734860384 is a deficient number, since it is larger than the sum of its proper divisors (21092305203616).

21247734860384 is a wasteful number, since it uses less digits than its factorization.

21247734860384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17286075 (or 17286067 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 59.

The spelling of 21247734860384 in words is "twenty-one trillion, two hundred forty-seven billion, seven hundred thirty-four million, eight hundred sixty thousand, three hundred eighty-four".