211003421 has 4 divisors (see below), whose sum is σ = 213178812. Its totient is φ = 208828032.

The previous prime is 211003381. The next prime is 211003423. The reversal of 211003421 is 124300112.

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 66667225 + 144336196 = 8165^2 + 12014^2 .

It is a cyclic number.

It is not a de Polignac number, because 211003421 - 2²² = 206809117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211003396 and 211003405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211003423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087550 + ... + 1087743.

It is an arithmetic number, because the mean of its divisors is an integer number (53294703).

Almost surely, 2^211003421 is an apocalyptic number.

It is an amenable number.

211003421 is a deficient number, since it is larger than the sum of its proper divisors (2175391).

211003421 is an equidigital number, since it uses as much as digits as its factorization.

211003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175390.

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

The square root of 211003421 is about 14525.9568015329. The cubic root of 211003421 is about 595.3373987345.

Adding to 211003421 its reverse (124300112), we get a palindrome (335303533).

The spelling of 211003421 in words is "two hundred eleven million, three thousand, four hundred twenty-one".