21244131342 has 96 divisors (see below), whose sum is σ = 53028967680. Its totient is φ = 6020956800.

The previous prime is 21244131317. The next prime is 21244131353. The reversal of 21244131342 is 24313144212.

21244131342 is a `hidden beast` number, since 212 + 4 + 413 + 1 + 34 + 2 = 666.

It is a super-2 number, since 2×21244131342² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11794842 + ... + 11796642.

It is an arithmetic number, because the mean of its divisors is an integer number (552385080).

Almost surely, 2^21244131342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21244131342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26514483840).

21244131342 is an abundant number, since it is smaller than the sum of its proper divisors (31784836338).

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

21244131342 is a wasteful number, since it uses less digits than its factorization.

21244131342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518 (or 2515 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21244131342 its reverse (24313144212), we get a palindrome (45557275554).

The spelling of 21244131342 in words is "twenty-one billion, two hundred forty-four million, one hundred thirty-one thousand, three hundred forty-two".