211201202012221 has 2 divisors, whose sum is σ = 211201202012222. Its totient is φ = 211201202012220.

The previous prime is 211201202012149. The next prime is 211201202012243. The reversal of 211201202012221 is 122210202102112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117753967102500 + 93447234909721 = 10851450^2 + 9666811^2 .

It is a cyclic number.

It is not a de Polignac number, because 211201202012221 - 2³⁵ = 211166842273853 is a prime.

It is a super-3 number, since 3×211201202012221³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211201202012321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600601006110 + 105600601006111.

It is an arithmetic number, because the mean of its divisors is an integer number (105600601006111).

Almost surely, 2^{211201202012221} is an apocalyptic number.

It is an amenable number.

211201202012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211201202012221 is an equidigital number, since it uses as much as digits as its factorization.

211201202012221 is an evil number, because the sum of its binary digits is even.

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

Adding to 211201202012221 its reverse (122210202102112), we get a palindrome (333411404114333).

The spelling of 211201202012221 in words is "two hundred eleven trillion, two hundred one billion, two hundred two million, twelve thousand, two hundred twenty-one".