210123023221 has 4 divisors (see below), whose sum is σ = 210150133132. Its totient is φ = 210095913312.

The previous prime is 210123023213. The next prime is 210123023287. The reversal of 210123023221 is 122320321012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201027586321 + 9095436900 = 448361^2 + 95370^2 .

It is a cyclic number.

It is not a de Polignac number, because 210123023221 - 2³ = 210123023213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210123023521) 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, 13543326 + ... + 13558831.

It is an arithmetic number, because the mean of its divisors is an integer number (52537533283).

Almost surely, 2^210123023221 is an apocalyptic number.

It is an amenable number.

210123023221 is a deficient number, since it is larger than the sum of its proper divisors (27109911).

210123023221 is an equidigital number, since it uses as much as digits as its factorization.

210123023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27109910.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 210123023221 its reverse (122320321012), we get a palindrome (332443344233).

The spelling of 210123023221 in words is "two hundred ten billion, one hundred twenty-three million, twenty-three thousand, two hundred twenty-one".