221210202020111 has 2 divisors, whose sum is σ = 221210202020112. Its totient is φ = 221210202020110.

The previous prime is 221210202020083. The next prime is 221210202020113. The reversal of 221210202020111 is 111020202012122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221210202020111 - 2³⁴ = 221193022150927 is a prime.

Together with 221210202020113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221210202020111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221210202020113) 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 as a sum of consecutive naturals, namely, 110605101010055 + 110605101010056.

It is an arithmetic number, because the mean of its divisors is an integer number (110605101010056).

Almost surely, 2^{221210202020111} is an apocalyptic number.

221210202020111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210202020111 is an equidigital number, since it uses as much as digits as its factorization.

221210202020111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221210202020111 its reverse (111020202012122), we get a palindrome (332230404032233).

The spelling of 221210202020111 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred two million, twenty thousand, one hundred eleven".