210220223121 has 12 divisors (see below), whose sum is σ = 304747651572. Its totient is φ = 139640868576.

The previous prime is 210220223117. The next prime is 210220223137. The reversal of 210220223121 is 121322022012.

210220223121 is a `hidden beast` number, since 210 + 2 + 202 + 231 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17652842496 + 192567380625 = 132864^2 + 438825^2 .

It is not a de Polignac number, because 210220223121 - 2² = 210220223117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210220223094 and 210220223103.

It is not an unprimeable number, because it can be changed into a prime (210220223021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42159606 + ... + 42164591.

It is an arithmetic number, because the mean of its divisors is an integer number (25395637631).

Almost surely, 2^210220223121 is an apocalyptic number.

It is an amenable number.

210220223121 is a deficient number, since it is larger than the sum of its proper divisors (94527428451).

210220223121 is a wasteful number, since it uses less digits than its factorization.

210220223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84324480 (or 84324477 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 210220223121 its reverse (121322022012), we get a palindrome (331542245133).

The spelling of 210220223121 in words is "two hundred ten billion, two hundred twenty million, two hundred twenty-three thousand, one hundred twenty-one".