202113123221 has 4 divisors (see below), whose sum is σ = 202378712844. Its totient is φ = 201847533600.

The previous prime is 202113123209. The next prime is 202113123271. The reversal of 202113123221 is 122321311202.

202113123221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3674056996 + 198439066225 = 60614^2 + 445465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202113123221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202113123193 and 202113123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202113123271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132793670 + ... + 132795191.

It is an arithmetic number, because the mean of its divisors is an integer number (50594678211).

Almost surely, 2^202113123221 is an apocalyptic number.

It is an amenable number.

202113123221 is a deficient number, since it is larger than the sum of its proper divisors (265589623).

202113123221 is an equidigital number, since it uses as much as digits as its factorization.

202113123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265589622.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 202113123221 its reverse (122321311202), we get a palindrome (324434434423).

The spelling of 202113123221 in words is "two hundred two billion, one hundred thirteen million, one hundred twenty-three thousand, two hundred twenty-one".