21113202436240 has 20 divisors (see below), whose sum is σ = 49088195664444. Its totient is φ = 8445280974464.

The previous prime is 21113202436223. The next prime is 21113202436243. The reversal of 21113202436240 is 4263420231112.

It can be written as a sum of positive squares in 2 ways, for example, as 12644823073936 + 8468379362304 = 3555956^2 + 2910048^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×21113202436240² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21113202436243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131957515147 + ... + 131957515306.

Almost surely, 2^{21113202436240} is an apocalyptic number.

21113202436240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113202436240 is an abundant number, since it is smaller than the sum of its proper divisors (27974993228204).

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

21113202436240 is a wasteful number, since it uses less digits than its factorization.

21113202436240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263915030466 (or 263915030460 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21113202436240 its reverse (4263420231112), we get a palindrome (25376622667352).

The spelling of 21113202436240 in words is "twenty-one trillion, one hundred thirteen billion, two hundred two million, four hundred thirty-six thousand, two hundred forty".