21094840224 has 36 divisors (see below), whose sum is σ = 59988452706. Its totient is φ = 7031613312.

The previous prime is 21094840223. The next prime is 21094840237. The reversal of 21094840224 is 42204849012.

It can be written as a sum of positive squares in only one way, i.e., 18027895824 + 3066944400 = 134268^2 + 55380^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21094840223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36622699 + ... + 36623274.

Almost surely, 2^21094840224 is an apocalyptic number.

21094840224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21094840224 is an abundant number, since it is smaller than the sum of its proper divisors (38893612482).

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

21094840224 is a wasteful number, since it uses less digits than its factorization.

21094840224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73245989 (or 73245978 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 21094840224 in words is "twenty-one billion, ninety-four million, eight hundred forty thousand, two hundred twenty-four".