202110120212221 has 4 divisors (see below), whose sum is σ = 217657052536252. Its totient is φ = 186563187888192.

The previous prime is 202110120212201. The next prime is 202110120212251. The reversal of 202110120212221 is 122212021011202.

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 77520188748025 + 124589931464196 = 8804555^2 + 11161986^2 .

It is a cyclic number.

It is not a de Polignac number, because 202110120212221 - 2²⁷ = 202109985994493 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 (202110120212201) 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, 7773466161996 + ... + 7773466162021.

It is an arithmetic number, because the mean of its divisors is an integer number (54414263134063).

Almost surely, 2^{202110120212221} is an apocalyptic number.

It is an amenable number.

202110120212221 is a deficient number, since it is larger than the sum of its proper divisors (15546932324031).

202110120212221 is a wasteful number, since it uses less digits than its factorization.

202110120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15546932324030.

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

Adding to 202110120212221 its reverse (122212021011202), we get a palindrome (324322141223423).

The spelling of 202110120212221 in words is "two hundred two trillion, one hundred ten billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".