210123220111221 has 64 divisors (see below), whose sum is σ = 297335951360000. Its totient is φ = 131622715929600.

The previous prime is 210123220111177. The next prime is 210123220111229. The reversal of 210123220111221 is 122111022321012.

It is not a de Polignac number, because 210123220111221 - 2¹⁹ = 210123219586933 is a prime.

It is a super-2 number, since 2×210123220111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210123220111229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5327783220 + ... + 5327822658.

It is an arithmetic number, because the mean of its divisors is an integer number (4645874240000).

Almost surely, 2^{210123220111221} is an apocalyptic number.

It is an amenable number.

210123220111221 is a deficient number, since it is larger than the sum of its proper divisors (87212731248779).

210123220111221 is a wasteful number, since it uses less digits than its factorization.

210123220111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41234.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 210123220111221 its reverse (122111022321012), we get a palindrome (332234242432233).

The spelling of 210123220111221 in words is "two hundred ten trillion, one hundred twenty-three billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty-one".