21003233031 has 24 divisors (see below), whose sum is σ = 33105320976. Its totient is φ = 12725648640.

The previous prime is 21003233029. The next prime is 21003233071. The reversal of 21003233031 is 13033230012.

It is not a de Polignac number, because 21003233031 - 2¹ = 21003233029 is a prime.

It is a super-2 number, since 2×21003233031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003232995 and 21003233013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003233021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347541 + ... + 403473.

It is an arithmetic number, because the mean of its divisors is an integer number (1379388374).

Almost surely, 2^21003233031 is an apocalyptic number.

21003233031 is a deficient number, since it is larger than the sum of its proper divisors (12102087945).

21003233031 is a wasteful number, since it uses less digits than its factorization.

21003233031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59743 (or 59740 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21003233031 its reverse (13033230012), we get a palindrome (34036463043).

The spelling of 21003233031 in words is "twenty-one billion, three million, two hundred thirty-three thousand, thirty-one".