21003013331 has 8 divisors (see below), whose sum is σ = 21740773680. Its totient is φ = 20266154272.

The previous prime is 21003013313. The next prime is 21003013351. The reversal of 21003013331 is 13331030012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003013331 - 2²² = 20998819027 is a prime.

It is a super-2 number, since 2×21003013331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003013351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177725 + ... + 271278.

It is an arithmetic number, because the mean of its divisors is an integer number (2717596710).

Almost surely, 2^21003013331 is an apocalyptic number.

21003013331 is a deficient number, since it is larger than the sum of its proper divisors (737760349).

21003013331 is a wasteful number, since it uses less digits than its factorization.

21003013331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450645.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21003013331 its reverse (13331030012), we get a palindrome (34334043343).

The spelling of 21003013331 in words is "twenty-one billion, three million, thirteen thousand, three hundred thirty-one".