212011222120021 has 4 divisors (see below), whose sum is σ = 218850293801344. Its totient is φ = 205172150438700.

The previous prime is 212011222119973. The next prime is 212011222120043. The reversal of 212011222120021 is 120021222110212.

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 not a de Polignac number, because 212011222120021 - 2³⁵ = 211976862381653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011222120081) 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 3 ways as a sum of consecutive naturals, for example, 3419535840615 + ... + 3419535840676.

It is an arithmetic number, because the mean of its divisors is an integer number (54712573450336).

Almost surely, 2^{212011222120021} is an apocalyptic number.

It is an amenable number.

212011222120021 is a deficient number, since it is larger than the sum of its proper divisors (6839071681323).

212011222120021 is an equidigital number, since it uses as much as digits as its factorization.

212011222120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839071681322.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212011222120021 its reverse (120021222110212), we get a palindrome (332032444230233).

The spelling of 212011222120021 in words is "two hundred twelve trillion, eleven billion, two hundred twenty-two million, one hundred twenty thousand, twenty-one".