21442365336 has 256 divisors, whose sum is σ = 69229900800. Its totient is φ = 5386715136.

The previous prime is 21442365331. The next prime is 21442365341. The reversal of 21442365336 is 63356324412.

It is an interprime number because it is at equal distance from previous prime (21442365331) and next prime (21442365341).

It is a junction number, because it is equal to n+sod(n) for n = 21442365294 and 21442365303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442365331) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3958566 + ... + 3963978.

It is an arithmetic number, because the mean of its divisors is an integer number (270429300).

Almost surely, 2^21442365336 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 21442365336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34614950400).

21442365336 is an abundant number, since it is smaller than the sum of its proper divisors (47787535464).

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

21442365336 is a wasteful number, since it uses less digits than its factorization.

21442365336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538 (or 5534 counting only the distinct ones).

The product of its digits is 311040, while the sum is 39.

Adding to 21442365336 its reverse (63356324412), we get a palindrome (84798689748).

The spelling of 21442365336 in words is "twenty-one billion, four hundred forty-two million, three hundred sixty-five thousand, three hundred thirty-six".