212121212221023 has 16 divisors (see below), whose sum is σ = 323232541082880. Its totient is φ = 121212039632256.

The previous prime is 212121212221003. The next prime is 212121212221117. The reversal of 212121212221023 is 320122212121212.

It is not a de Polignac number, because 212121212221023 - 2¹⁷ = 212121212089951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212121212220984 and 212121212221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121212221003) 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 15 ways as a sum of consecutive naturals, for example, 43669036 + ... + 48282782.

It is an arithmetic number, because the mean of its divisors is an integer number (20202033817680).

Almost surely, 2^{212121212221023} is an apocalyptic number.

212121212221023 is a deficient number, since it is larger than the sum of its proper divisors (111111328861857).

212121212221023 is a wasteful number, since it uses less digits than its factorization.

212121212221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803086.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 212121212221023 its reverse (320122212121212), we get a palindrome (532243424342235).

The spelling of 212121212221023 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, twenty-three".