21003031133 has 4 divisors (see below), whose sum is σ = 24003464160. Its totient is φ = 18002598108.

The previous prime is 21003031117. The next prime is 21003031139. The reversal of 21003031133 is 33113030012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21003031133 - 2⁴ = 21003031117 is a prime.

It is a super-2 number, since 2×21003031133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003031139) 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, 1500216503 + ... + 1500216516.

It is an arithmetic number, because the mean of its divisors is an integer number (6000866040).

Almost surely, 2^21003031133 is an apocalyptic number.

It is an amenable number.

21003031133 is a deficient number, since it is larger than the sum of its proper divisors (3000433027).

21003031133 is an equidigital number, since it uses as much as digits as its factorization.

21003031133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000433026.

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

Adding to 21003031133 its reverse (33113030012), we get a palindrome (54116061145).

The spelling of 21003031133 in words is "twenty-one billion, three million, thirty-one thousand, one hundred thirty-three".