212011222112021 has 4 divisors (see below), whose sum is σ = 212050360242252. Its totient is φ = 211972083981792.

The previous prime is 212011222111981. The next prime is 212011222112057. The reversal of 212011222112021 is 120211222110212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69696199980625 + 142315022131396 = 8348425^2 + 11929586^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011222112021 - 2²² = 212011217917717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212011222111984 and 212011222112002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011222412021) 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, 19569056990 + ... + 19569067823.

It is an arithmetic number, because the mean of its divisors is an integer number (53012590060563).

Almost surely, 2^{212011222112021} is an apocalyptic number.

It is an amenable number.

212011222112021 is a deficient number, since it is larger than the sum of its proper divisors (39138130231).

212011222112021 is an equidigital number, since it uses as much as digits as its factorization.

212011222112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39138130230.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212011222112021 its reverse (120211222110212), we get a palindrome (332222444222233).

The spelling of 212011222112021 in words is "two hundred twelve trillion, eleven billion, two hundred twenty-two million, one hundred twelve thousand, twenty-one".