21713498752 has 64 divisors (see below), whose sum is σ = 47357465760. Its totient is φ = 9834716160.

The previous prime is 21713498731. The next prime is 21713498759. The reversal of 21713498752 is 25789431712.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21713498696 and 21713498705.

It is not an unprimeable number, because it can be changed into a prime (21713498759) 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, 371218 + ... + 425710.

Almost surely, 2^21713498752 is an apocalyptic number.

21713498752 is a gapful number since it is divisible by the number (22) 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 21713498752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23678732880).

21713498752 is an abundant number, since it is smaller than the sum of its proper divisors (25643967008).

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

21713498752 is a wasteful number, since it uses less digits than its factorization.

21713498752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54801 (or 54789 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The spelling of 21713498752 in words is "twenty-one billion, seven hundred thirteen million, four hundred ninety-eight thousand, seven hundred fifty-two".