21748924116 has 60 divisors (see below), whose sum is σ = 56950165888. Its totient is φ = 7237632528.

The previous prime is 21748924097. The next prime is 21748924121. The reversal of 21748924116 is 61142984712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 141375 + ... + 251961.

Almost surely, 2^21748924116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21748924116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28475082944).

21748924116 is an abundant number, since it is smaller than the sum of its proper divisors (35201241772).

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

21748924116 is a wasteful number, since it uses less digits than its factorization.

21748924116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111210 (or 111199 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 21748924116 in words is "twenty-one billion, seven hundred forty-eight million, nine hundred twenty-four thousand, one hundred sixteen".