212112110021 has 4 divisors (see below), whose sum is σ = 242413840032. Its totient is φ = 181810380012.

The previous prime is 212112110011. The next prime is 212112110027. The reversal of 212112110021 is 120011211212.

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 212112110021 - 2¹⁴ = 212112093637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212112109978 and 212112110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112110027) 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, 15150864995 + ... + 15150865008.

It is an arithmetic number, because the mean of its divisors is an integer number (60603460008).

Almost surely, 2^212112110021 is an apocalyptic number.

It is an amenable number.

212112110021 is a deficient number, since it is larger than the sum of its proper divisors (30301730011).

212112110021 is an equidigital number, since it uses as much as digits as its factorization.

212112110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30301730010.

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

Adding to 212112110021 its reverse (120011211212), we get a palindrome (332123321233).

The spelling of 212112110021 in words is "two hundred twelve billion, one hundred twelve million, one hundred ten thousand, twenty-one".