210431421 has 6 divisors (see below), whose sum is σ = 303956510. Its totient is φ = 140287608.

The previous prime is 210431413. The next prime is 210431449. The reversal of 210431421 is 124134012.

210431421 is a `hidden beast` number, since 210 + 4 + 31 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 205205625 + 5225796 = 14325^2 + 2286^2 .

It is not a de Polignac number, because 210431421 - 2³ = 210431413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210431394 and 210431403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210431411) 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 5 ways as a sum of consecutive naturals, for example, 11690626 + ... + 11690643.

Almost surely, 2^210431421 is an apocalyptic number.

It is an amenable number.

210431421 is a deficient number, since it is larger than the sum of its proper divisors (93525089).

210431421 is a wasteful number, since it uses less digits than its factorization.

210431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23381275 (or 23381272 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 210431421 is about 14506.2545476081. The cubic root of 210431421 is about 594.7989538019.

Adding to 210431421 its reverse (124134012), we get a palindrome (334565433).

The spelling of 210431421 in words is "two hundred ten million, four hundred thirty-one thousand, four hundred twenty-one".