202102310310221 has 4 divisors (see below), whose sum is σ = 202352127752700. Its totient is φ = 201852492867744.

The previous prime is 202102310310209. The next prime is 202102310310227. The reversal of 202102310310221 is 122013013201202.

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 155236374253321 + 46865936056900 = 12459389^2 + 6845870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202102310310221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202102310310193 and 202102310310202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102310310227) 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, 124908720026 + ... + 124908721643.

It is an arithmetic number, because the mean of its divisors is an integer number (50588031938175).

Almost surely, 2^{202102310310221} is an apocalyptic number.

It is an amenable number.

202102310310221 is a deficient number, since it is larger than the sum of its proper divisors (249817442479).

202102310310221 is an equidigital number, since it uses as much as digits as its factorization.

202102310310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249817442478.

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

Adding to 202102310310221 its reverse (122013013201202), we get a palindrome (324115323511423).

The spelling of 202102310310221 in words is "two hundred two trillion, one hundred two billion, three hundred ten million, three hundred ten thousand, two hundred twenty-one".