21550530132 has 72 divisors (see below), whose sum is σ = 57986510400. Its totient is φ = 6728946048.

The previous prime is 21550530073. The next prime is 21550530137. The reversal of 21550530132 is 23103505512.

It is a happy number.

21550530132 is a `hidden beast` number, since 21 + 5 + 505 + 3 + 0 + 132 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21550530096 and 21550530105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550530137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116128 + ... + 237879.

It is an arithmetic number, because the mean of its divisors is an integer number (805368200).

Almost surely, 2^21550530132 is an apocalyptic number.

It is an amenable number.

21550530132 is an abundant number, since it is smaller than the sum of its proper divisors (36435980268).

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

21550530132 is a wasteful number, since it uses less digits than its factorization.

21550530132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354125 (or 354120 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 21550530132 in words is "twenty-one billion, five hundred fifty million, five hundred thirty thousand, one hundred thirty-two".