21021130033 has 4 divisors (see below), whose sum is σ = 21062922048. Its totient is φ = 20979338020.

The previous prime is 21021130007. The next prime is 21021130051. The reversal of 21021130033 is 33003112012.

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 21021130033 - 2¹³ = 21021121841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021129989 and 21021130016.

It is not an unprimeable number, because it can be changed into a prime (21021134033) 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, 20895253 + ... + 20896258.

It is an arithmetic number, because the mean of its divisors is an integer number (5265730512).

Almost surely, 2^21021130033 is an apocalyptic number.

It is an amenable number.

21021130033 is a deficient number, since it is larger than the sum of its proper divisors (41792015).

21021130033 is an equidigital number, since it uses as much as digits as its factorization.

21021130033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41792014.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21021130033 its reverse (33003112012), we get a palindrome (54024242045).

The spelling of 21021130033 in words is "twenty-one billion, twenty-one million, one hundred thirty thousand, thirty-three".