2185721040832 has 112 divisors (see below), whose sum is σ = 5044501642752. Its totient is φ = 920276904960.

The previous prime is 2185721040809. The next prime is 2185721040847. The reversal of 2185721040832 is 2380401275812.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×2185721040832² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8880258 + ... + 9123070.

Almost surely, 2^{2185721040832} 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 2185721040832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2522250821376).

2185721040832 is an abundant number, since it is smaller than the sum of its proper divisors (2858780601920).

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

2185721040832 is a wasteful number, since it uses less digits than its factorization.

2185721040832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243186 (or 243176 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 2185721040832 in words is "two trillion, one hundred eighty-five billion, seven hundred twenty-one million, forty thousand, eight hundred thirty-two".