21859170032 has 80 divisors (see below), whose sum is σ = 48910202880. Its totient is φ = 9270464256.

The previous prime is 21859169977. The next prime is 21859170037. The reversal of 21859170032 is 23007195812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859170037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4318319 + ... + 4323377.

It is an arithmetic number, because the mean of its divisors is an integer number (611377536).

Almost surely, 2^21859170032 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 21859170032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24455101440).

21859170032 is an abundant number, since it is smaller than the sum of its proper divisors (27051032848).

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

21859170032 is a wasteful number, since it uses less digits than its factorization.

21859170032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470 (or 5464 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 21859170032 in words is "twenty-one billion, eight hundred fifty-nine million, one hundred seventy thousand, thirty-two".