21744311958 has 48 divisors (see below), whose sum is σ = 51493193856. Its totient is φ = 6601685760.

The previous prime is 21744311957. The next prime is 21744312011. The reversal of 21744311958 is 85911344712.

21744311958 is a `hidden beast` number, since 2 + 17 + 443 + 1 + 195 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744311957) 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 23 ways as a sum of consecutive naturals, for example, 1136641 + ... + 1155612.

It is an arithmetic number, because the mean of its divisors is an integer number (1072774872).

Almost surely, 2^21744311958 is an apocalyptic number.

21744311958 is an abundant number, since it is smaller than the sum of its proper divisors (29748881898).

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

21744311958 is a wasteful number, since it uses less digits than its factorization.

21744311958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292309 (or 2292306 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 21744311958 in words is "twenty-one billion, seven hundred forty-four million, three hundred eleven thousand, nine hundred fifty-eight".