21003301332 has 36 divisors (see below), whose sum is σ = 57175654900. Its totient is φ = 6462554112.

The previous prime is 21003301331. The next prime is 21003301339. The reversal of 21003301332 is 23310330012.

21003301332 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 330 + 1 + 332 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12226609476 + 8776691856 = 110574^2 + 93684^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21003301332² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003301331) 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 11 ways as a sum of consecutive naturals, for example, 22438957 + ... + 22439892.

Almost surely, 2^21003301332 is an apocalyptic number.

It is an amenable number.

21003301332 is an abundant number, since it is smaller than the sum of its proper divisors (36172353568).

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

21003301332 is a wasteful number, since it uses less digits than its factorization.

21003301332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44878872 (or 44878867 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21003301332 its reverse (23310330012), we get a palindrome (44313631344).

The spelling of 21003301332 in words is "twenty-one billion, three million, three hundred one thousand, three hundred thirty-two".