211102202221 has 2 divisors, whose sum is σ = 211102202222. Its totient is φ = 211102202220.

The previous prime is 211102202141. The next prime is 211102202231. The reversal of 211102202221 is 122202201112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143746381321 + 67355820900 = 379139^2 + 259530^2 .

It is a cyclic number.

It is not a de Polignac number, because 211102202221 - 2⁷ = 211102202093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211102202195 and 211102202204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211102202231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105551101110 + 105551101111.

It is an arithmetic number, because the mean of its divisors is an integer number (105551101111).

Almost surely, 2^211102202221 is an apocalyptic number.

It is an amenable number.

211102202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211102202221 is an equidigital number, since it uses as much as digits as its factorization.

211102202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211102202221 its reverse (122202201112), we get a palindrome (333304403333).

The spelling of 211102202221 in words is "two hundred eleven billion, one hundred two million, two hundred two thousand, two hundred twenty-one".