21052234503681 has 32 divisors (see below), whose sum is σ = 30062305889280. Its totient is φ = 13064707598400.

The previous prime is 21052234503593. The next prime is 21052234503691. The reversal of 21052234503681 is 18630543225012.

It is not a de Polignac number, because 21052234503681 - 2¹¹ = 21052234501633 is a prime.

It is a super-2 number, since 2×21052234503681² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21052234503691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258396 + ... + 6493938.

It is an arithmetic number, because the mean of its divisors is an integer number (939447059040).

Almost surely, 2^{21052234503681} is an apocalyptic number.

It is an amenable number.

21052234503681 is a deficient number, since it is larger than the sum of its proper divisors (9010071385599).

21052234503681 is a wasteful number, since it uses less digits than its factorization.

21052234503681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6236597.

The product of its (nonzero) digits is 345600, while the sum is 42.

Adding to 21052234503681 its reverse (18630543225012), we get a palindrome (39682777728693).

The spelling of 21052234503681 in words is "twenty-one trillion, fifty-two billion, two hundred thirty-four million, five hundred three thousand, six hundred eighty-one".