21031130033 has 4 divisors (see below), whose sum is σ = 21031425828. Its totient is φ = 21030834240.

The previous prime is 21031130017. The next prime is 21031130051. The reversal of 21031130033 is 33003113012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13057175824 + 7973954209 = 114268^2 + 89297^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031130033 - 2⁴ = 21031130017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031129993 and 21031130020.

It is not an unprimeable number, because it can be changed into a prime (21031130063) 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, 30413 + ... + 207333.

It is an arithmetic number, because the mean of its divisors is an integer number (5257856457).

Almost surely, 2^21031130033 is an apocalyptic number.

It is an amenable number.

21031130033 is a deficient number, since it is larger than the sum of its proper divisors (295795).

21031130033 is a wasteful number, since it uses less digits than its factorization.

21031130033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295794.

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

Adding to 21031130033 its reverse (33003113012), we get a palindrome (54034243045).

The spelling of 21031130033 in words is "twenty-one billion, thirty-one million, one hundred thirty thousand, thirty-three".