16973321820 has 192 divisors, whose sum is σ = 58922228736. Its totient is φ = 3554887680.

The previous prime is 16973321789. The next prime is 16973321821. The reversal of 16973321820 is 2812337961.

It is a super-2 number, since 2×16973321820² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16973321821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 736675 + ... + 759365.

It is an arithmetic number, because the mean of its divisors is an integer number (306886608).

Almost surely, 2^16973321820 is an apocalyptic number.

16973321820 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 16973321820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29461114368).

16973321820 is an abundant number, since it is smaller than the sum of its proper divisors (41948906916).

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

16973321820 is a wasteful number, since it uses less digits than its factorization.

16973321820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22860 (or 22858 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 16973321820 in words is "sixteen billion, nine hundred seventy-three million, three hundred twenty-one thousand, eight hundred twenty".