210121022122201 has 4 divisors (see below), whose sum is σ = 210121071034932. Its totient is φ = 210120973209472.

The previous prime is 210121022122153. The next prime is 210121022122211. The reversal of 210121022122201 is 102221220121012.

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 10971490280976 + 199149531841225 = 3312324^2 + 14112035^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121022122201 - 2¹³ = 210121022114009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210121022122211) 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, 17318116 + ... + 26835781.

It is an arithmetic number, because the mean of its divisors is an integer number (52530267758733).

Almost surely, 2^{210121022122201} is an apocalyptic number.

It is an amenable number.

210121022122201 is a deficient number, since it is larger than the sum of its proper divisors (48912731).

210121022122201 is an equidigital number, since it uses as much as digits as its factorization.

210121022122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48912730.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210121022122201 its reverse (102221220121012), we get a palindrome (312342242243213).

The spelling of 210121022122201 in words is "two hundred ten trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty-two thousand, two hundred one".