210221310123 has 32 divisors (see below), whose sum is σ = 359737009920. Its totient is φ = 119912330880.

The previous prime is 210221310109. The next prime is 210221310137. The reversal of 210221310123 is 321013122012.

210221310123 is a `hidden beast` number, since 2 + 10 + 221 + 310 + 123 = 666.

It is an interprime number because it is at equal distance from previous prime (210221310109) and next prime (210221310137).

It is not a de Polignac number, because 210221310123 - 2¹⁰ = 210221309099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221310096 and 210221310105.

It is not an unprimeable number, because it can be changed into a prime (210221310163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20813065 + ... + 20823162.

It is an arithmetic number, because the mean of its divisors is an integer number (11241781560).

Almost surely, 2^210221310123 is an apocalyptic number.

210221310123 is a deficient number, since it is larger than the sum of its proper divisors (149515699797).

210221310123 is a wasteful number, since it uses less digits than its factorization.

210221310123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41636264 (or 41636258 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 210221310123 its reverse (321013122012), we get a palindrome (531234432135).

The spelling of 210221310123 in words is "two hundred ten billion, two hundred twenty-one million, three hundred ten thousand, one hundred twenty-three".