212011011220121 has 4 divisors (see below), whose sum is σ = 212256678673152. Its totient is φ = 211765343767092.

The previous prime is 212011011220111. The next prime is 212011011220133. The reversal of 212011011220121 is 121022110110212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212011011220121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212011011220121.

It is not an unprimeable number, because it can be changed into a prime (212011011220111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122833725221 + ... + 122833726946.

It is an arithmetic number, because the mean of its divisors is an integer number (53064169668288).

Almost surely, 2^{212011011220121} is an apocalyptic number.

It is an amenable number.

212011011220121 is a deficient number, since it is larger than the sum of its proper divisors (245667453031).

212011011220121 is an equidigital number, since it uses as much as digits as its factorization.

212011011220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245667453030.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212011011220121 its reverse (121022110110212), we get a palindrome (333033121330333).

The spelling of 212011011220121 in words is "two hundred twelve trillion, eleven billion, eleven million, two hundred twenty thousand, one hundred twenty-one".