21243340112 has 10 divisors (see below), whose sum is σ = 41158971498. Its totient is φ = 10621670048.

The previous prime is 21243340093. The next prime is 21243340133. The reversal of 21243340112 is 21104334212.

It can be written as a sum of positive squares in only one way, i.e., 17088764176 + 4154575936 = 130724^2 + 64456^2 .

It is a super-2 number, since 2×21243340112² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663854363 + ... + 663854394.

Almost surely, 2^21243340112 is an apocalyptic number.

It is an amenable number.

21243340112 is a deficient number, since it is larger than the sum of its proper divisors (19915631386).

21243340112 is a wasteful number, since it uses less digits than its factorization.

21243340112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327708765 (or 1327708759 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21243340112 its reverse (21104334212), we get a palindrome (42347674324).

The spelling of 21243340112 in words is "twenty-one billion, two hundred forty-three million, three hundred forty thousand, one hundred twelve".