21003431032 has 16 divisors (see below), whose sum is σ = 39450411000. Its totient is φ = 10483321440.

The previous prime is 21003431027. The next prime is 21003431039. The reversal of 21003431032 is 23013430012.

It is a super-2 number, since 2×21003431032² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003431039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294407 + ... + 2303542.

Almost surely, 2^21003431032 is an apocalyptic number.

It is an amenable number.

21003431032 is a deficient number, since it is larger than the sum of its proper divisors (18446979968).

21003431032 is a wasteful number, since it uses less digits than its factorization.

21003431032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4598526 (or 4598522 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003431032 its reverse (23013430012), we get a palindrome (44016861044).

The spelling of 21003431032 in words is "twenty-one billion, three million, four hundred thirty-one thousand, thirty-two".