210122221021 has 4 divisors (see below), whose sum is σ = 210670843392. Its totient is φ = 209573598652.

The previous prime is 210122221019. The next prime is 210122221063. The reversal of 210122221021 is 120122221012.

It is a happy number.

210122221021 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 210122221021 - 2¹ = 210122221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210122220986 and 210122221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210122221081) 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, 274310611 + ... + 274311376.

It is an arithmetic number, because the mean of its divisors is an integer number (52667710848).

Almost surely, 2^210122221021 is an apocalyptic number.

It is an amenable number.

210122221021 is a deficient number, since it is larger than the sum of its proper divisors (548622371).

210122221021 is an equidigital number, since it uses as much as digits as its factorization.

210122221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548622370.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210122221021 its reverse (120122221012), we get a palindrome (330244442033).

Subtracting from 210122221021 its reverse (120122221012), we obtain a palindrome (90000000009).

The spelling of 210122221021 in words is "two hundred ten billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-one".