21125006033 has 4 divisors (see below), whose sum is σ = 21695952180. Its totient is φ = 20554059888.

The previous prime is 21125006027. The next prime is 21125006047. The reversal of 21125006033 is 33060052112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19586562304 + 1538443729 = 139952^2 + 39223^2 .

It is a cyclic number.

It is not a de Polignac number, because 21125006033 - 2⁶ = 21125005969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21125006003) 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, 285473018 + ... + 285473091.

It is an arithmetic number, because the mean of its divisors is an integer number (5423988045).

Almost surely, 2^21125006033 is an apocalyptic number.

It is an amenable number.

21125006033 is a deficient number, since it is larger than the sum of its proper divisors (570946147).

21125006033 is an equidigital number, since it uses as much as digits as its factorization.

21125006033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570946146.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21125006033 its reverse (33060052112), we get a palindrome (54185058145).

The spelling of 21125006033 in words is "twenty-one billion, one hundred twenty-five million, six thousand, thirty-three".