221212012020211 has 4 divisors (see below), whose sum is σ = 221347144588752. Its totient is φ = 221076879451672.

The previous prime is 221212012020173. The next prime is 221212012020289. The reversal of 221212012020211 is 112020210212122.

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 221212012020211 - 2²⁹ = 221211475149299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212012020011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67566281815 + ... + 67566285088.

It is an arithmetic number, because the mean of its divisors is an integer number (55336786147188).

Almost surely, 2^{221212012020211} is an apocalyptic number.

221212012020211 is a deficient number, since it is larger than the sum of its proper divisors (135132568541).

221212012020211 is a wasteful number, since it uses less digits than its factorization.

221212012020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135132568540.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221212012020211 its reverse (112020210212122), we get a palindrome (333232222232333).

The spelling of 221212012020211 in words is "two hundred twenty-one trillion, two hundred twelve billion, twelve million, twenty thousand, two hundred eleven".