211397121 has 24 divisors (see below), whose sum is σ = 341024320. Its totient is φ = 130088592.

The previous prime is 211397119. The next prime is 211397129. The reversal of 211397121 is 121793112.

It is not a de Polignac number, because 211397121 - 2¹ = 211397119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (211397129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30301 + ... + 36618.

Almost surely, 2^211397121 is an apocalyptic number.

It is an amenable number.

211397121 is a deficient number, since it is larger than the sum of its proper divisors (129627199).

211397121 is an equidigital number, since it uses as much as digits as its factorization.

211397121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66947 (or 66935 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 211397121 is about 14539.5020891363. The cubic root of 211397121 is about 595.7074380900.

The spelling of 211397121 in words is "two hundred eleven million, three hundred ninety-seven thousand, one hundred twenty-one".