16421478720 has 224 divisors, whose sum is σ = 54112582656. Its totient is φ = 4214784000.

The previous prime is 16421478691. The next prime is 16421478721. The reversal of 16421478720 is 2787412461.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421478721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5861320 + ... + 5864120.

Almost surely, 2^16421478720 is an apocalyptic number.

16421478720 is a gapful number since it is divisible by the number (10) 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 16421478720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27056291328).

16421478720 is an abundant number, since it is smaller than the sum of its proper divisors (37691103936).

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

16421478720 is a wasteful number, since it uses less digits than its factorization.

16421478720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049 (or 3039 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 16421478720 in words is "sixteen billion, four hundred twenty-one million, four hundred seventy-eight thousand, seven hundred twenty".