212011220221221 has 8 divisors (see below), whose sum is σ = 285595870538944. Its totient is φ = 139883691692160.

The previous prime is 212011220221133. The next prime is 212011220221247. The reversal of 212011220221221 is 122122022110212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212011220221221 - 2¹¹ = 212011220219173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011220231221) 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 7 ways as a sum of consecutive naturals, for example, 364280446825 + ... + 364280447406.

It is an arithmetic number, because the mean of its divisors is an integer number (35699483817368).

Almost surely, 2^{212011220221221} is an apocalyptic number.

It is an amenable number.

212011220221221 is a deficient number, since it is larger than the sum of its proper divisors (73584650317723).

212011220221221 is an equidigital number, since it uses as much as digits as its factorization.

212011220221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728560894331.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212011220221221 its reverse (122122022110212), we get a palindrome (334133242331433).

The spelling of 212011220221221 in words is "two hundred twelve trillion, eleven billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".