21013343432 has 8 divisors (see below), whose sum is σ = 39400018950. Its totient is φ = 10506671712.

The previous prime is 21013343423. The next prime is 21013343443. The reversal of 21013343432 is 23434331012.

It can be written as a sum of positive squares in only one way, i.e., 12774876676 + 8238466756 = 113026^2 + 90766^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313333957 + ... + 1313333972.

Almost surely, 2^21013343432 is an apocalyptic number.

It is an amenable number.

21013343432 is a deficient number, since it is larger than the sum of its proper divisors (18386675518).

21013343432 is a wasteful number, since it uses less digits than its factorization.

21013343432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626667935 (or 2626667931 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21013343432 its reverse (23434331012), we get a palindrome (44447674444).

The spelling of 21013343432 in words is "twenty-one billion, thirteen million, three hundred forty-three thousand, four hundred thirty-two".