210212212121021 has 16 divisors (see below), whose sum is σ = 242815066072128. Its totient is φ = 179858420601600.

The previous prime is 210212212121011. The next prime is 210212212121027. The reversal of 210212212121021 is 120121212212012.

It is a cyclic number.

It is not a de Polignac number, because 210212212121021 - 2⁶ = 210212212120957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210212212120984 and 210212212121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212212121027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7597526 + ... + 21866568.

It is an arithmetic number, because the mean of its divisors is an integer number (15175941629508).

Almost surely, 2^{210212212121021} is an apocalyptic number.

It is an amenable number.

210212212121021 is a deficient number, since it is larger than the sum of its proper divisors (32602853951107).

210212212121021 is a wasteful number, since it uses less digits than its factorization.

210212212121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14347852.

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

Adding to 210212212121021 its reverse (120121212212012), we get a palindrome (330333424333033).

Subtracting from 210212212121021 its reverse (120121212212012), we obtain a palindrome (90090999909009).

The spelling of 210212212121021 in words is "two hundred ten trillion, two hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".