212121201121121 has 8 divisors (see below), whose sum is σ = 212347652520960. Its totient is φ = 211894816562352.

The previous prime is 212121201121099. The next prime is 212121201121147. The reversal of 212121201121121 is 121121102121212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212121201121121 - 2¹⁴ = 212121201104737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121201121093 and 212121201121102.

It is not an unprimeable number, because it can be changed into a prime (212121201124121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10358561 + ... + 23055198.

It is an arithmetic number, because the mean of its divisors is an integer number (26543456565120).

Almost surely, 2^{212121201121121} is an apocalyptic number.

It is an amenable number.

212121201121121 is a deficient number, since it is larger than the sum of its proper divisors (226451399839).

212121201121121 is a wasteful number, since it uses less digits than its factorization.

212121201121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33420535.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212121201121121 its reverse (121121102121212), we get a palindrome (333242303242333).

The spelling of 212121201121121 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred twenty-one".