21194248416 has 96 divisors (see below), whose sum is σ = 61260167808. Its totient is φ = 6362442240.

The previous prime is 21194248409. The next prime is 21194248417. The reversal of 21194248416 is 61484249112.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194248417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19206 + ... + 206778.

It is an arithmetic number, because the mean of its divisors is an integer number (638126748).

Almost surely, 2^21194248416 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 21194248416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30630083904).

21194248416 is an abundant number, since it is smaller than the sum of its proper divisors (40065919392).

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

21194248416 is a wasteful number, since it uses less digits than its factorization.

21194248416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187704 (or 187696 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The spelling of 21194248416 in words is "twenty-one billion, one hundred ninety-four million, two hundred forty-eight thousand, four hundred sixteen".