212101112021 has 4 divisors (see below), whose sum is σ = 219414943500. Its totient is φ = 204787280544.

The previous prime is 212101112011. The next prime is 212101112053. The reversal of 212101112021 is 120211101212.

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 51170964100 + 160930147921 = 226210^2 + 401161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212101112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212101111987 and 212101112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101112011) 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, 3656915696 + ... + 3656915753.

It is an arithmetic number, because the mean of its divisors is an integer number (54853735875).

Almost surely, 2^212101112021 is an apocalyptic number.

It is an amenable number.

212101112021 is a deficient number, since it is larger than the sum of its proper divisors (7313831479).

212101112021 is an equidigital number, since it uses as much as digits as its factorization.

212101112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7313831478.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212101112021 its reverse (120211101212), we get a palindrome (332312213233).

The spelling of 212101112021 in words is "two hundred twelve billion, one hundred one million, one hundred twelve thousand, twenty-one".