212112021220121 has 4 divisors (see below), whose sum is σ = 231394932240144. Its totient is φ = 192829110200100.

The previous prime is 212112021220109. The next prime is 212112021220139. The reversal of 212112021220121 is 121022120211212.

212112021220121 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212112021220121 - 2¹⁴ = 212112021203737 is a prime.

It is a super-2 number, since 2×212112021220121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212112021220093 and 212112021220102.

It is not an unprimeable number, because it can be changed into a prime (212112021120121) 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, 9641455509995 + ... + 9641455510016.

It is an arithmetic number, because the mean of its divisors is an integer number (57848733060036).

Almost surely, 2^{212112021220121} is an apocalyptic number.

It is an amenable number.

212112021220121 is a deficient number, since it is larger than the sum of its proper divisors (19282911020023).

212112021220121 is a wasteful number, since it uses less digits than its factorization.

212112021220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19282911020022.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212112021220121 its reverse (121022120211212), we get a palindrome (333134141431333).

The spelling of 212112021220121 in words is "two hundred twelve trillion, one hundred twelve billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".