211201222020421 has 2 divisors, whose sum is σ = 211201222020422. Its totient is φ = 211201222020420.

The previous prime is 211201222020391. The next prime is 211201222020443. The reversal of 211201222020421 is 124020222102112.

It is an a-pointer prime, because the next prime (211201222020443) can be obtained adding 211201222020421 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206192081172100 + 5009140848321 = 14359390^2 + 2238111^2 .

It is a cyclic number.

It is not a de Polignac number, because 211201222020421 - 2¹⁷ = 211201221889349 is a prime.

It is a super-3 number, since 3×211201222020421³ (a number of 44 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211201222020392 and 211201222020401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211201222020521) 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, 105600611010210 + 105600611010211.

It is an arithmetic number, because the mean of its divisors is an integer number (105600611010211).

Almost surely, 2^{211201222020421} is an apocalyptic number.

It is an amenable number.

211201222020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

211201222020421 is an equidigital number, since it uses as much as digits as its factorization.

211201222020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211201222020421 its reverse (124020222102112), we get a palindrome (335221444122533).

The spelling of 211201222020421 in words is "two hundred eleven trillion, two hundred one billion, two hundred twenty-two million, twenty thousand, four hundred twenty-one".