21003042032 has 40 divisors (see below), whose sum is σ = 46699769952. Its totient is φ = 8963942400.

The previous prime is 21003041993. The next prime is 21003042059. The reversal of 21003042032 is 23024030012.

It is a super-2 number, since 2×21003042032² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003042032.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 362069 + ... + 416052.

Almost surely, 2^21003042032 is an apocalyptic number.

It is an amenable number.

21003042032 is an abundant number, since it is smaller than the sum of its proper divisors (25696727920).

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

21003042032 is a wasteful number, since it uses less digits than its factorization.

21003042032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778377 (or 778371 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21003042032 its reverse (23024030012), we get a palindrome (44027072044).

The spelling of 21003042032 in words is "twenty-one billion, three million, forty-two thousand, thirty-two".