210112210021 has 4 divisors (see below), whose sum is σ = 240128240032. Its totient is φ = 180096180012.

The previous prime is 210112210003. The next prime is 210112210103. The reversal of 210112210021 is 120012211012.

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 210112210021 - 2²³ = 210103821413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210112209983 and 210112210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210112010021) 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, 15008014995 + ... + 15008015008.

It is an arithmetic number, because the mean of its divisors is an integer number (60032060008).

Almost surely, 2^210112210021 is an apocalyptic number.

It is an amenable number.

210112210021 is a deficient number, since it is larger than the sum of its proper divisors (30016030011).

210112210021 is an equidigital number, since it uses as much as digits as its factorization.

210112210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30016030010.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210112210021 its reverse (120012211012), we get a palindrome (330124421033).

Subtracting from 210112210021 its reverse (120012211012), we obtain a palindrome (90099999009).

The spelling of 210112210021 in words is "two hundred ten billion, one hundred twelve million, two hundred ten thousand, twenty-one".