211203210421 has 4 divisors (see below), whose sum is σ = 241375097632. Its totient is φ = 181031323212.

The previous prime is 211203210391. The next prime is 211203210431. The reversal of 211203210421 is 124012302112.

211203210421 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, 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 211203210421 - 2⁹ = 211203209909 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 (211203210431) 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, 15085943595 + ... + 15085943608.

It is an arithmetic number, because the mean of its divisors is an integer number (60343774408).

Almost surely, 2^211203210421 is an apocalyptic number.

It is an amenable number.

211203210421 is a deficient number, since it is larger than the sum of its proper divisors (30171887211).

211203210421 is an equidigital number, since it uses as much as digits as its factorization.

211203210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30171887210.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 211203210421 its reverse (124012302112), we get a palindrome (335215512533).

The spelling of 211203210421 in words is "two hundred eleven billion, two hundred three million, two hundred ten thousand, four hundred twenty-one".