211243120221 has 32 divisors (see below), whose sum is σ = 339033840640. Its totient is φ = 114290434944.

The previous prime is 211243120171. The next prime is 211243120223. The reversal of 211243120221 is 122021342112.

It is a happy number.

211243120221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211243120221 - 2⁷ = 211243120093 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211243120223) 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 31 ways as a sum of consecutive naturals, for example, 533841 + ... + 841113.

It is an arithmetic number, because the mean of its divisors is an integer number (10594807520).

Almost surely, 2^211243120221 is an apocalyptic number.

211243120221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211243120221 is a deficient number, since it is larger than the sum of its proper divisors (127790720419).

211243120221 is a wasteful number, since it uses less digits than its factorization.

211243120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309025.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 211243120221 its reverse (122021342112), we get a palindrome (333264462333).

The spelling of 211243120221 in words is "two hundred eleven billion, two hundred forty-three million, one hundred twenty thousand, two hundred twenty-one".