212121101122211 has 4 divisors (see below), whose sum is σ = 212121162668472. Its totient is φ = 212121039575952.

The previous prime is 212121101122169. The next prime is 212121101122219. The reversal of 212121101122211 is 112221101121212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212121101122211 - 2²² = 212121096927907 is a prime.

It is a super-3 number, since 3×212121101122211³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121101122219) 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 3 ways as a sum of consecutive naturals, for example, 25276010 + ... + 32605503.

It is an arithmetic number, because the mean of its divisors is an integer number (53030290667118).

Almost surely, 2^{212121101122211} is an apocalyptic number.

212121101122211 is a deficient number, since it is larger than the sum of its proper divisors (61546261).

212121101122211 is an equidigital number, since it uses as much as digits as its factorization.

212121101122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61546260.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212121101122211 its reverse (112221101121212), we get a palindrome (324342202243423).

Subtracting from 212121101122211 its reverse (112221101121212), we obtain a palindrome (99900000000999).

The spelling of 212121101122211 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, two hundred eleven".