211440321 has 32 divisors (see below), whose sum is σ = 322358400. Its totient is φ = 136892160.

The previous prime is 211440319. The next prime is 211440377. The reversal of 211440321 is 123044112.

It is not a de Polignac number, because 211440321 - 2¹ = 211440319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211440294 and 211440303.

It is not an unprimeable number, because it can be changed into a prime (211440301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 452530 + ... + 452996.

It is an arithmetic number, because the mean of its divisors is an integer number (10073700).

Almost surely, 2^211440321 is an apocalyptic number.

It is an amenable number.

211440321 is a deficient number, since it is larger than the sum of its proper divisors (110918079).

211440321 is a wasteful number, since it uses less digits than its factorization.

211440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 211440321 is about 14540.9876212037. The cubic root of 211440321 is about 595.7480138689.

Adding to 211440321 its reverse (123044112), we get a palindrome (334484433).

The spelling of 211440321 in words is "two hundred eleven million, four hundred forty thousand, three hundred twenty-one".