21331131003 has 32 divisors (see below), whose sum is σ = 38894374400. Its totient is φ = 11251584288.

The previous prime is 21331131001. The next prime is 21331131007. The reversal of 21331131003 is 30013113312.

It is a happy number.

21331131003 is a `hidden beast` number, since 21 + 331 + 1 + 310 + 0 + 3 = 666.

It is not a de Polignac number, because 21331131003 - 2¹ = 21331131001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331131001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4338433 + ... + 4343346.

It is an arithmetic number, because the mean of its divisors is an integer number (1215449200).

Almost surely, 2^21331131003 is an apocalyptic number.

21331131003 is a deficient number, since it is larger than the sum of its proper divisors (17563243397).

21331131003 is a wasteful number, since it uses less digits than its factorization.

21331131003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8681808 (or 8681802 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21331131003 its reverse (30013113312), we get a palindrome (51344244315).

The spelling of 21331131003 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty-one thousand, three".