211012321 has 4 divisors (see below), whose sum is σ = 227244052. Its totient is φ = 194780592.

The previous prime is 211012303. The next prime is 211012343. The reversal of 211012321 is 123210112.

211012321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98227921 + 112784400 = 9911^2 + 10620^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012321 - 2⁹ = 211011809 is a prime.

It is a super-2 number, since 2×211012321² = 89052399227614082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 16231717 = 211012321 / (2 + 1 + 1 + 0 + 1 + 2 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211012391) 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, 8115846 + ... + 8115871.

It is an arithmetic number, because the mean of its divisors is an integer number (56811013).

Almost surely, 2^211012321 is an apocalyptic number.

It is an amenable number.

211012321 is a deficient number, since it is larger than the sum of its proper divisors (16231731).

211012321 is a wasteful number, since it uses less digits than its factorization.

211012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16231730.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 211012321 is about 14526.2631464530. The cubic root of 211012321 is about 595.3457689437.

Adding to 211012321 its reverse (123210112), we get a palindrome (334222433).

The spelling of 211012321 in words is "two hundred eleven million, twelve thousand, three hundred twenty-one".