202102100221 has 4 divisors (see below), whose sum is σ = 230973828832. Its totient is φ = 173230371612.

The previous prime is 202102100131. The next prime is 202102100257. The reversal of 202102100221 is 122001201202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202102100221 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 (202102130221) 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, 14435864295 + ... + 14435864308.

It is an arithmetic number, because the mean of its divisors is an integer number (57743457208).

Almost surely, 2^202102100221 is an apocalyptic number.

It is an amenable number.

202102100221 is a deficient number, since it is larger than the sum of its proper divisors (28871728611).

202102100221 is an equidigital number, since it uses as much as digits as its factorization.

202102100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28871728610.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202102100221 its reverse (122001201202), we get a palindrome (324103301423).

The spelling of 202102100221 in words is "two hundred two billion, one hundred two million, one hundred thousand, two hundred twenty-one".