21744644231274 has 16 divisors (see below), whose sum is σ = 43525141146912. Its totient is φ = 7242239296368.

The previous prime is 21744644231273. The next prime is 21744644231281. The reversal of 21744644231274 is 47213244644712.

It is not an unprimeable number, because it can be changed into a prime (21744644231273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493853964 + ... + 1493868519.

It is an arithmetic number, because the mean of its divisors is an integer number (2720321321682).

Almost surely, 2^{21744644231274} is an apocalyptic number.

21744644231274 is an abundant number, since it is smaller than the sum of its proper divisors (21780496915638).

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

21744644231274 is a wasteful number, since it uses less digits than its factorization.

21744644231274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987723701.

The product of its digits is 7225344, while the sum is 51.

Adding to 21744644231274 its reverse (47213244644712), we get a palindrome (68957888875986).

The spelling of 21744644231274 in words is "twenty-one trillion, seven hundred forty-four billion, six hundred forty-four million, two hundred thirty-one thousand, two hundred seventy-four".