211321055 has 12 divisors (see below), whose sum is σ = 278735016. Its totient is φ = 153687600.

The previous prime is 211321051. The next prime is 211321069. The reversal of 211321055 is 550123112.

It is a happy number.

It is not a de Polignac number, because 211321055 - 2² = 211321051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211321051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174041 + ... + 175250.

It is an arithmetic number, because the mean of its divisors is an integer number (23227918).

Almost surely, 2^211321055 is an apocalyptic number.

211321055 is a deficient number, since it is larger than the sum of its proper divisors (67413961).

211321055 is a wasteful number, since it uses less digits than its factorization.

211321055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349318 (or 349307 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 211321055 is about 14536.8860145493. The cubic root of 211321055 is about 595.6359793464.

Adding to 211321055 its reverse (550123112), we get a palindrome (761444167).

The spelling of 211321055 in words is "two hundred eleven million, three hundred twenty-one thousand, fifty-five".