21003412032 has 42 divisors (see below), whose sum is σ = 60202489958. Its totient is φ = 7001137152.

The previous prime is 21003412013. The next prime is 21003412099. The reversal of 21003412032 is 23021430012.

It can be written as a sum of positive squares in only one way, i.e., 19369958976 + 1633453056 = 139176^2 + 40416^2 .

It is a super-2 number, since 2×21003412032² (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 junction number, because it is equal to n+sod(n) for n = 21003411996 and 21003412014.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18231553 + ... + 18232704.

Almost surely, 2^21003412032 is an apocalyptic number.

It is an amenable number.

21003412032 is an abundant number, since it is smaller than the sum of its proper divisors (39199077926).

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

21003412032 is a wasteful number, since it uses less digits than its factorization.

21003412032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36464275 (or 36464262 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21003412032 its reverse (23021430012), we get a palindrome (44024842044).

The spelling of 21003412032 in words is "twenty-one billion, three million, four hundred twelve thousand, thirty-two".