21066562332 has 72 divisors (see below), whose sum is σ = 53933954256. Its totient is φ = 6932335104.

The previous prime is 21066562331. The next prime is 21066562351. The reversal of 21066562332 is 23326566012.

21066562332 is a `hidden beast` number, since 2 + 1 + 0 + 66 + 562 + 3 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066562331) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7220538 + ... + 7223454.

It is an arithmetic number, because the mean of its divisors is an integer number (749082698).

Almost surely, 2^21066562332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21066562332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26966977128).

21066562332 is an abundant number, since it is smaller than the sum of its proper divisors (32867391924).

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

21066562332 is a wasteful number, since it uses less digits than its factorization.

21066562332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5427 (or 5422 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 21066562332 in words is "twenty-one billion, sixty-six million, five hundred sixty-two thousand, three hundred thirty-two".