211221122020211 has 4 divisors (see below), whose sum is σ = 220404649064592. Its totient is φ = 202037594975832.

The previous prime is 211221122020189. The next prime is 211221122020283. The reversal of 211221122020211 is 112020221122112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221122020211 is a prime.

It is a super-2 number, since 2×211221122020211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221122020291) 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, 4591763522156 + ... + 4591763522201.

It is an arithmetic number, because the mean of its divisors is an integer number (55101162266148).

Almost surely, 2^{211221122020211} is an apocalyptic number.

211221122020211 is a deficient number, since it is larger than the sum of its proper divisors (9183527044381).

211221122020211 is an equidigital number, since it uses as much as digits as its factorization.

211221122020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9183527044380.

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

Adding to 211221122020211 its reverse (112020221122112), we get a palindrome (323241343142323).

The spelling of 211221122020211 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-two million, twenty thousand, two hundred eleven".