21748193604 has 96 divisors (see below), whose sum is σ = 57372022400. Its totient is φ = 7122660480.

The previous prime is 21748193603. The next prime is 21748193617. The reversal of 21748193604 is 40639184712.

21748193604 is a `hidden beast` number, since 21 + 7 + 4 + 8 + 19 + 3 + 604 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21748193604.

It is not an unprimeable number, because it can be changed into a prime (21748193603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10717662 + ... + 10719690.

Almost surely, 2^21748193604 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 21748193604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28686011200).

21748193604 is an abundant number, since it is smaller than the sum of its proper divisors (35623828796).

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

21748193604 is a wasteful number, since it uses less digits than its factorization.

21748193604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 21748193604 in words is "twenty-one billion, seven hundred forty-eight million, one hundred ninety-three thousand, six hundred four".