21530045532 has 24 divisors (see below), whose sum is σ = 50369334400. Its totient is φ = 7157744496.

The previous prime is 21530045531. The next prime is 21530045599. The reversal of 21530045532 is 23554003512.

It is a self number, because there is not a number n which added to its sum of digits gives 21530045532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530045531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2362432 + ... + 2371527.

Almost surely, 2^21530045532 is an apocalyptic number.

It is an amenable number.

21530045532 is an abundant number, since it is smaller than the sum of its proper divisors (28839288868).

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

21530045532 is a wasteful number, since it uses less digits than its factorization.

21530045532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734345 (or 4734343 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The spelling of 21530045532 in words is "twenty-one billion, five hundred thirty million, forty-five thousand, five hundred thirty-two".