21431334252 has 24 divisors (see below), whose sum is σ = 50008831600. Its totient is φ = 7143437376.

The previous prime is 21431334251. The next prime is 21431334299. The reversal of 21431334252 is 25243313412.

It is not an unprimeable number, because it can be changed into a prime (21431334251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423774 + ... + 471642.

Almost surely, 2^21431334252 is an apocalyptic number.

It is an amenable number.

21431334252 is an abundant number, since it is smaller than the sum of its proper divisors (28577497348).

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

21431334252 is a wasteful number, since it uses less digits than its factorization.

21431334252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85185 (or 85183 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

Adding to 21431334252 its reverse (25243313412), we get a palindrome (46674647664).

The spelling of 21431334252 in words is "twenty-one billion, four hundred thirty-one million, three hundred thirty-four thousand, two hundred fifty-two".