212112210110021 has 4 divisors (see below), whose sum is σ = 228428533964652. Its totient is φ = 195795886255392.

The previous prime is 212112210109979. The next prime is 212112210110027. The reversal of 212112210110021 is 120011012211212.

212112210110021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 122463770332225 + 89648439777796 = 11066335^2 + 9468286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212112210110021 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 (212112210110027) 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, 8158161927296 + ... + 8158161927321.

It is an arithmetic number, because the mean of its divisors is an integer number (57107133491163).

Almost surely, 2^{212112210110021} is an apocalyptic number.

It is an amenable number.

212112210110021 is a deficient number, since it is larger than the sum of its proper divisors (16316323854631).

212112210110021 is a wasteful number, since it uses less digits than its factorization.

212112210110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16316323854630.

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

Adding to 212112210110021 its reverse (120011012211212), we get a palindrome (332123222321233).

The spelling of 212112210110021 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred ten million, one hundred ten thousand, twenty-one".