212121022011211 has 2 divisors, whose sum is σ = 212121022011212. Its totient is φ = 212121022011210.

The previous prime is 212121022011209. The next prime is 212121022011247. The reversal of 212121022011211 is 112110220121212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212121022011211 - 2¹ = 212121022011209 is a prime.

It is a super-3 number, since 3×212121022011211³ (a number of 44 digits) contains 333 as substring.

Together with 212121022011209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212121022911211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060511005605 + 106060511005606.

It is an arithmetic number, because the mean of its divisors is an integer number (106060511005606).

Almost surely, 2^{212121022011211} is an apocalyptic number.

212121022011211 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121022011211 is an equidigital number, since it uses as much as digits as its factorization.

212121022011211 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 19.

Adding to 212121022011211 its reverse (112110220121212), we get a palindrome (324231242132423).

The spelling of 212121022011211 in words is "two hundred twelve trillion, one hundred twenty-one billion, twenty-two million, eleven thousand, two hundred eleven".