212040321 has 4 divisors (see below), whose sum is σ = 282720432. Its totient is φ = 141360212.

The previous prime is 212040313. The next prime is 212040329. The reversal of 212040321 is 123040212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (212040313) and next prime (212040329).

It is a cyclic number.

It is not a de Polignac number, because 212040321 - 2³ = 212040313 is a prime.

It is a super-2 number, since 2×212040321² = 89922195459566082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212040321.

It is not an unprimeable number, because it can be changed into a prime (212040329) 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 3 ways as a sum of consecutive naturals, for example, 35340051 + ... + 35340056.

It is an arithmetic number, because the mean of its divisors is an integer number (70680108).

Almost surely, 2^212040321 is an apocalyptic number.

It is an amenable number.

212040321 is a deficient number, since it is larger than the sum of its proper divisors (70680111).

212040321 is an equidigital number, since it uses as much as digits as its factorization.

212040321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70680110.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 212040321 is about 14561.6043415552. The cubic root of 212040321 is about 596.3109957861.

Adding to 212040321 its reverse (123040212), we get a palindrome (335080533).

The spelling of 212040321 in words is "two hundred twelve million, forty thousand, three hundred twenty-one".