211202210102221 has 4 divisors (see below), whose sum is σ = 227448533956252. Its totient is φ = 194955886248192.

The previous prime is 211202210102197. The next prime is 211202210102251. The reversal of 211202210102221 is 122201012202112.

211202210102221 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 145033584054121 + 66168626048100 = 12042989^2 + 8134410^2 .

It is a cyclic number.

It is not a de Polignac number, because 211202210102221 - 2⁹ = 211202210101709 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 (211202210102251) 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, 8123161926996 + ... + 8123161927021.

It is an arithmetic number, because the mean of its divisors is an integer number (56862133489063).

Almost surely, 2^{211202210102221} is an apocalyptic number.

It is an amenable number.

211202210102221 is a deficient number, since it is larger than the sum of its proper divisors (16246323854031).

211202210102221 is a wasteful number, since it uses less digits than its factorization.

211202210102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16246323854030.

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

Adding to 211202210102221 its reverse (122201012202112), we get a palindrome (333403222304333).

The spelling of 211202210102221 in words is "two hundred eleven trillion, two hundred two billion, two hundred ten million, one hundred two thousand, two hundred twenty-one".