212022121121 has 4 divisors (see below), whose sum is σ = 214576604592. Its totient is φ = 209467637652.

The previous prime is 212022121081. The next prime is 212022121123. The reversal of 212022121121 is 121121220212.

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 212022121121 - 2¹⁸ = 212021858977 is a prime.

It is a super-3 number, since 3×212022121121³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212022121121.

It is not an unprimeable number, because it can be changed into a prime (212022121123) 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, 1277241611 + ... + 1277241776.

It is an arithmetic number, because the mean of its divisors is an integer number (53644151148).

Almost surely, 2^212022121121 is an apocalyptic number.

It is an amenable number.

212022121121 is a deficient number, since it is larger than the sum of its proper divisors (2554483471).

212022121121 is an equidigital number, since it uses as much as digits as its factorization.

212022121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554483470.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212022121121 its reverse (121121220212), we get a palindrome (333143341333).

Subtracting from 212022121121 its reverse (121121220212), we obtain a palindrome (90900900909).

The spelling of 212022121121 in words is "two hundred twelve billion, twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".