21532030452 has 18 divisors (see below), whose sum is σ = 54428188178. Its totient is φ = 7177343472.

The previous prime is 21532030447. The next prime is 21532030501. The reversal of 21532030452 is 25403023512.

It is a happy number.

21532030452 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 203 + 0 + 452 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14076398736 + 7455631716 = 118644^2 + 86346^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 299055943 + ... + 299056014.

Almost surely, 2^21532030452 is an apocalyptic number.

It is an amenable number.

21532030452 is an abundant number, since it is smaller than the sum of its proper divisors (32896157726).

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

21532030452 is a wasteful number, since it uses less digits than its factorization.

21532030452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598111967 (or 598111962 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21532030452 its reverse (25403023512), we get a palindrome (46935053964).

The spelling of 21532030452 in words is "twenty-one billion, five hundred thirty-two million, thirty thousand, four hundred fifty-two".