21842660573646 has 128 divisors (see below), whose sum is σ = 48713502228480. Its totient is φ = 6473451456000.

The previous prime is 21842660573627. The next prime is 21842660573651. The reversal of 21842660573646 is 64637506624812.

It is a self number, because there is not a number n which added to its sum of digits gives 21842660573646.

It is a congruent number.

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, 598033941 + ... + 598070463.

It is an arithmetic number, because the mean of its divisors is an integer number (380574236160).

Almost surely, 2^{21842660573646} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21842660573646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24356751114240).

21842660573646 is an abundant number, since it is smaller than the sum of its proper divisors (26870841654834).

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

21842660573646 is a wasteful number, since it uses less digits than its factorization.

21842660573646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37382.

The product of its (nonzero) digits is 69672960, while the sum is 60.

The spelling of 21842660573646 in words is "twenty-one trillion, eight hundred forty-two billion, six hundred sixty million, five hundred seventy-three thousand, six hundred forty-six".