21494468016 has 320 divisors, whose sum is σ = 74764738560. Its totient is φ = 5781611520.

The previous prime is 21494467961. The next prime is 21494468057. The reversal of 21494468016 is 61086449412.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3465430 + ... + 3471626.

It is an arithmetic number, because the mean of its divisors is an integer number (233639808).

Almost surely, 2^21494468016 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 21494468016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37382369280).

21494468016 is an abundant number, since it is smaller than the sum of its proper divisors (53270270544).

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

21494468016 is a wasteful number, since it uses less digits than its factorization.

21494468016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289 (or 6277 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21494468016 in words is "twenty-one billion, four hundred ninety-four million, four hundred sixty-eight thousand, sixteen".