16621421806080 has 2880 divisors, whose sum is σ = 75601284422400. Its totient is φ = 3449090211840.

The previous prime is 16621421806079. The next prime is 16621421806141. The reversal of 16621421806080 is 8060812412661.

It is a happy number.

16621421806080 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 14 + 21 + 8 + 0 + 608 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2880).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 40639172916 + ... + 40639173324.

It is an arithmetic number, because the mean of its divisors is an integer number (26250445980).

Almost surely, 2^{16621421806080} is an apocalyptic number.

16621421806080 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 16621421806080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37800642211200).

16621421806080 is an abundant number, since it is smaller than the sum of its proper divisors (58979862616320).

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

16621421806080 is a wasteful number, since it uses less digits than its factorization.

16621421806080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 16621421806080 in words is "sixteen trillion, six hundred twenty-one billion, four hundred twenty-one million, eight hundred six thousand, eighty".