212121112022211 has 64 divisors (see below), whose sum is σ = 327586860195840. Its totient is φ = 119588418144000.

The previous prime is 212121112022203. The next prime is 212121112022243. The reversal of 212121112022211 is 112220211121212.

It is not a de Polignac number, because 212121112022211 - 2³ = 212121112022203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (212121112022311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9722733375 + ... + 9722755191.

It is an arithmetic number, because the mean of its divisors is an integer number (5118544690560).

Almost surely, 2^{212121112022211} is an apocalyptic number.

212121112022211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212121112022211 is a deficient number, since it is larger than the sum of its proper divisors (115465748173629).

212121112022211 is a wasteful number, since it uses less digits than its factorization.

212121112022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39424.

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

Adding to 212121112022211 its reverse (112220211121212), we get a palindrome (324341323143423).

Subtracting from 212121112022211 its reverse (112220211121212), we obtain a palindrome (99900900900999).

The spelling of 212121112022211 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twelve million, twenty-two thousand, two hundred eleven".