212021121211211 has 16 divisors (see below), whose sum is σ = 241769313420768. Its totient is φ = 184193499072000.

The previous prime is 212021121211181. The next prime is 212021121211223. The reversal of 212021121211211 is 112112121120212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212021121211211 - 2¹⁰ = 212021121210187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021121211511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8237765 + ... + 22178886.

It is an arithmetic number, because the mean of its divisors is an integer number (15110582088798).

Almost surely, 2^{212021121211211} is an apocalyptic number.

212021121211211 is a deficient number, since it is larger than the sum of its proper divisors (29748192209557).

212021121211211 is a wasteful number, since it uses less digits than its factorization.

212021121211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30448222.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212021121211211 its reverse (112112121120212), we get a palindrome (324133242331423).

Subtracting from 212021121211211 its reverse (112112121120212), we obtain a palindrome (99909000090999).

The spelling of 212021121211211 in words is "two hundred twelve trillion, twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred eleven".