211030421 has 4 divisors (see below), whose sum is σ = 241177632. Its totient is φ = 180883212.

The previous prime is 211030399. The next prime is 211030441. The reversal of 211030421 is 124030112.

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 211030421 - 2⁶ = 211030357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211030396 and 211030405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211030441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15073595 + ... + 15073608.

It is an arithmetic number, because the mean of its divisors is an integer number (60294408).

Almost surely, 2^211030421 is an apocalyptic number.

It is an amenable number.

211030421 is a deficient number, since it is larger than the sum of its proper divisors (30147211).

211030421 is an equidigital number, since it uses as much as digits as its factorization.

211030421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30147210.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 211030421 is about 14526.8861425978. The cubic root of 211030421 is about 595.3627907781.

Adding to 211030421 its reverse (124030112), we get a palindrome (335060533).

The spelling of 211030421 in words is "two hundred eleven million, thirty thousand, four hundred twenty-one".