210120021013 has 4 divisors (see below), whose sum is σ = 240137166880. Its totient is φ = 180102875148.

The previous prime is 210120020963. The next prime is 210120021017. The reversal of 210120021013 is 310120021012.

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 not a de Polignac number, because 210120021013 - 2²⁵ = 210086466581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210120020984 and 210120021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120021017) 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, 15008572923 + ... + 15008572936.

It is an arithmetic number, because the mean of its divisors is an integer number (60034291720).

Almost surely, 2^210120021013 is an apocalyptic number.

It is an amenable number.

210120021013 is a deficient number, since it is larger than the sum of its proper divisors (30017145867).

210120021013 is an equidigital number, since it uses as much as digits as its factorization.

210120021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30017145866.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 210120021013 its reverse (310120021012), we get a palindrome (520240042025).

Subtracting 210120021013 from its reverse (310120021012), we obtain a palindrome (99999999999).

The spelling of 210120021013 in words is "two hundred ten billion, one hundred twenty million, twenty-one thousand, thirteen".