21304134552 has 16 divisors (see below), whose sum is σ = 53260336440. Its totient is φ = 7101378176.

The previous prime is 21304134539. The next prime is 21304134569. The reversal of 21304134552 is 25543140312.

It is a super-2 number, since 2×21304134552² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 443836113 + ... + 443836160.

Almost surely, 2^21304134552 is an apocalyptic number.

It is an amenable number.

21304134552 is an abundant number, since it is smaller than the sum of its proper divisors (31956201888).

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

21304134552 is a wasteful number, since it uses less digits than its factorization.

21304134552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887672282 (or 887672278 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21304134552 its reverse (25543140312), we get a palindrome (46847274864).

The spelling of 21304134552 in words is "twenty-one billion, three hundred four million, one hundred thirty-four thousand, five hundred fifty-two".