210023130021 has 4 divisors (see below), whose sum is σ = 280030840032. Its totient is φ = 140015420012.

The previous prime is 210023129983. The next prime is 210023130041. The reversal of 210023130021 is 120031320012.

210023130021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210023130021 - 2¹¹ = 210023127973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210023130041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35003855001 + ... + 35003855006.

It is an arithmetic number, because the mean of its divisors is an integer number (70007710008).

Almost surely, 2^210023130021 is an apocalyptic number.

It is an amenable number.

210023130021 is a deficient number, since it is larger than the sum of its proper divisors (70007710011).

210023130021 is an equidigital number, since it uses as much as digits as its factorization.

210023130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70007710010.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 210023130021 its reverse (120031320012), we get a palindrome (330054450033).

The spelling of 210023130021 in words is "two hundred ten billion, twenty-three million, one hundred thirty thousand, twenty-one".