212112121002121 has 4 divisors (see below), whose sum is σ = 221334387132672. Its totient is φ = 202889854871572.

The previous prime is 212112121002091. The next prime is 212112121002191. The reversal of 212112121002121 is 121200121211212.

It is a happy number.

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 212112121002121 - 2³⁹ = 211562365188233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212112121002191) 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, 4611133065241 + ... + 4611133065286.

It is an arithmetic number, because the mean of its divisors is an integer number (55333596783168).

Almost surely, 2^{212112121002121} is an apocalyptic number.

It is an amenable number.

212112121002121 is a deficient number, since it is larger than the sum of its proper divisors (9222266130551).

212112121002121 is an equidigital number, since it uses as much as digits as its factorization.

212112121002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222266130550.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212112121002121 its reverse (121200121211212), we get a palindrome (333312242213333).

The spelling of 212112121002121 in words is "two hundred twelve trillion, one hundred twelve billion, one hundred twenty-one million, two thousand, one hundred twenty-one".