21244841892 has 96 divisors (see below), whose sum is σ = 56622249600. Its totient is φ = 6883595136.

The previous prime is 21244841881. The next prime is 21244841899. The reversal of 21244841892 is 29814844212.

21244841892 is a `hidden beast` number, since 21 + 2 + 448 + 4 + 189 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21244841899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5804359 + ... + 5808017.

It is an arithmetic number, because the mean of its divisors is an integer number (589815100).

Almost surely, 2^21244841892 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 21244841892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28311124800).

21244841892 is an abundant number, since it is smaller than the sum of its proper divisors (35377407708).

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

21244841892 is a wasteful number, since it uses less digits than its factorization.

21244841892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5162 (or 5154 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The spelling of 21244841892 in words is "twenty-one billion, two hundred forty-four million, eight hundred forty-one thousand, eight hundred ninety-two".