212021111212221 has 32 divisors (see below), whose sum is σ = 291013314900480. Its totient is φ = 137206050755904.

The previous prime is 212021111212159. The next prime is 212021111212271. The reversal of 212021111212221 is 122212111120212.

It is not a de Polignac number, because 212021111212221 - 2¹⁰ = 212021111211197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021111212271) 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 in 31 ways as a sum of consecutive naturals, for example, 655757026 + ... + 656080268.

It is an arithmetic number, because the mean of its divisors is an integer number (9094166090640).

Almost surely, 2^{212021111212221} is an apocalyptic number.

It is an amenable number.

212021111212221 is a deficient number, since it is larger than the sum of its proper divisors (78992203688259).

212021111212221 is a wasteful number, since it uses less digits than its factorization.

212021111212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337065.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212021111212221 its reverse (122212111120212), we get a palindrome (334233222332433).

The spelling of 212021111212221 in words is "two hundred twelve trillion, twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-one".