201021213 has 4 divisors (see below), whose sum is σ = 268028288. Its totient is φ = 134014140.

The previous prime is 201021211. The next prime is 201021229. The reversal of 201021213 is 312120102.

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 not a de Polignac number, because 201021213 - 2¹ = 201021211 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 (201021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33503533 + ... + 33503538.

It is an arithmetic number, because the mean of its divisors is an integer number (67007072).

Almost surely, 2^201021213 is an apocalyptic number.

It is an amenable number.

201021213 is a deficient number, since it is larger than the sum of its proper divisors (67007075).

201021213 is an equidigital number, since it uses as much as digits as its factorization.

201021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67007074.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 201021213 is about 14178.1949838476. The cubic root of 201021213 is about 585.7972066364.

Adding to 201021213 its reverse (312120102), we get a palindrome (513141315).

The spelling of 201021213 in words is "two hundred one million, twenty-one thousand, two hundred thirteen".