211303312021 has 4 divisors (see below), whose sum is σ = 211304916544. Its totient is φ = 211301707500.

The previous prime is 211303312019. The next prime is 211303312027. The reversal of 211303312021 is 120213303112.

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 a cyclic number.

It is not a de Polignac number, because 211303312021 - 2¹ = 211303312019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211303312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211303312027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585135 + ... + 874636.

It is an arithmetic number, because the mean of its divisors is an integer number (52826229136).

Almost surely, 2^211303312021 is an apocalyptic number.

It is an amenable number.

211303312021 is a deficient number, since it is larger than the sum of its proper divisors (1604523).

211303312021 is a wasteful number, since it uses less digits than its factorization.

211303312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604522.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211303312021 its reverse (120213303112), we get a palindrome (331516615133).

The spelling of 211303312021 in words is "two hundred eleven billion, three hundred three million, three hundred twelve thousand, twenty-one".