21534055552 has 32 divisors (see below), whose sum is σ = 42912078300. Its totient is φ = 10763965440.

The previous prime is 21534055549. The next prime is 21534055553. The reversal of 21534055552 is 25555043512.

It can be written as a sum of positive squares in 2 ways, for example, as 21533801536 + 254016 = 146744^2 + 504^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21534055553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467074 + ... + 511102.

Almost surely, 2^21534055552 is an apocalyptic number.

It is an amenable number.

21534055552 is a deficient number, since it is larger than the sum of its proper divisors (21378022748).

21534055552 is an equidigital number, since it uses as much as digits as its factorization.

21534055552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47864 (or 47852 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 37.

The spelling of 21534055552 in words is "twenty-one billion, five hundred thirty-four million, fifty-five thousand, five hundred fifty-two".