21040242344 has 64 divisors (see below), whose sum is σ = 45401472000. Its totient is φ = 9040489920.

The previous prime is 21040242337. The next prime is 21040242383. The reversal of 21040242344 is 44324204012.

It is a happy number.

It is a super-2 number, since 2×21040242344² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760547 + ... + 787725.

It is an arithmetic number, because the mean of its divisors is an integer number (709398000).

Almost surely, 2^21040242344 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 21040242344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22700736000).

21040242344 is an abundant number, since it is smaller than the sum of its proper divisors (24361229656).

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

21040242344 is a wasteful number, since it uses less digits than its factorization.

21040242344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27678 (or 27674 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21040242344 its reverse (44324204012), we get a palindrome (65364446356).

The spelling of 21040242344 in words is "twenty-one billion, forty million, two hundred forty-two thousand, three hundred forty-four".