212121022211121 has 8 divisors (see below), whose sum is σ = 282865505202144. Its totient is φ = 141395277013760.

The previous prime is 212121022211057. The next prime is 212121022211123. The reversal of 212121022211121 is 121112220121212.

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 212121022211121 - 2⁶ = 212121022211057 is a prime.

It is a super-3 number, since 3×212121022211121³ (a number of 44 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212121022211123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4684422000 + ... + 4684467281.

It is an arithmetic number, because the mean of its divisors is an integer number (35358188150268).

Almost surely, 2^{212121022211121} is an apocalyptic number.

It is an amenable number.

212121022211121 is a deficient number, since it is larger than the sum of its proper divisors (70744482991023).

212121022211121 is an equidigital number, since it uses as much as digits as its factorization.

212121022211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9368896831.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212121022211121 its reverse (121112220121212), we get a palindrome (333233242332333).

The spelling of 212121022211121 in words is "two hundred twelve trillion, one hundred twenty-one billion, twenty-two million, two hundred eleven thousand, one hundred twenty-one".