211403023021 has 4 divisors (see below), whose sum is σ = 211412350044. Its totient is φ = 211393696000.

The previous prime is 211403023001. The next prime is 211403023033. The reversal of 211403023021 is 120320304112.

It is a happy number.

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 52831022500 + 158572000521 = 229850^2 + 398211^2 .

It is a cyclic number.

It is not a de Polignac number, because 211403023021 - 2¹¹ = 211403020973 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 211403023021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211403023001) 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, 4629430 + ... + 4674871.

It is an arithmetic number, because the mean of its divisors is an integer number (52853087511).

Almost surely, 2^211403023021 is an apocalyptic number.

It is an amenable number.

211403023021 is a deficient number, since it is larger than the sum of its proper divisors (9327023).

211403023021 is an equidigital number, since it uses as much as digits as its factorization.

211403023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9327022.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 211403023021 its reverse (120320304112), we get a palindrome (331723327133).

The spelling of 211403023021 in words is "two hundred eleven billion, four hundred three million, twenty-three thousand, twenty-one".