212311103112021 has 4 divisors (see below), whose sum is σ = 283081470816032. Its totient is φ = 141540735408012.

The previous prime is 212311103111983. The next prime is 212311103112041. The reversal of 212311103112021 is 120211301113212.

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 not a de Polignac number, because 212311103112021 - 2⁶ = 212311103111957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212311103112041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35385183852001 + ... + 35385183852006.

It is an arithmetic number, because the mean of its divisors is an integer number (70770367704008).

Almost surely, 2^{212311103112021} is an apocalyptic number.

It is an amenable number.

212311103112021 is a deficient number, since it is larger than the sum of its proper divisors (70770367704011).

212311103112021 is an equidigital number, since it uses as much as digits as its factorization.

212311103112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70770367704010.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 212311103112021 its reverse (120211301113212), we get a palindrome (332522404225233).

The spelling of 212311103112021 in words is "two hundred twelve trillion, three hundred eleven billion, one hundred three million, one hundred twelve thousand, twenty-one".