21050134432 has 12 divisors (see below), whose sum is σ = 41442452226. Its totient is φ = 10525067200.

The previous prime is 21050134423. The next prime is 21050134453. The reversal of 21050134432 is 23443105012.

It can be written as a sum of positive squares in only one way, i.e., 21049367056 + 767376 = 145084^2 + 876^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21050134397 and 21050134406.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 328908319 + ... + 328908382.

Almost surely, 2^21050134432 is an apocalyptic number.

It is an amenable number.

21050134432 is a deficient number, since it is larger than the sum of its proper divisors (20392317794).

21050134432 is an equidigital number, since it uses as much as digits as its factorization.

21050134432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657816711 (or 657816703 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21050134432 its reverse (23443105012), we get a palindrome (44493239444).

The spelling of 21050134432 in words is "twenty-one billion, fifty million, one hundred thirty-four thousand, four hundred thirty-two".