210421404331 has 2 divisors, whose sum is σ = 210421404332. Its totient is φ = 210421404330.

The previous prime is 210421404329. The next prime is 210421404337. The reversal of 210421404331 is 133404124012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210421404331 - 2¹ = 210421404329 is a prime.

It is a super-2 number, since 2×210421404331² (a number of 23 digits) contains 22 as substring.

Together with 210421404329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 210421404296 and 210421404305.

It is not a weakly prime, because it can be changed into another prime (210421404337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105210702165 + 105210702166.

It is an arithmetic number, because the mean of its divisors is an integer number (105210702166).

Almost surely, 2^210421404331 is an apocalyptic number.

210421404331 is a deficient number, since it is larger than the sum of its proper divisors (1).

210421404331 is an equidigital number, since it uses as much as digits as its factorization.

210421404331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 210421404331 its reverse (133404124012), we get a palindrome (343825528343).

The spelling of 210421404331 in words is "two hundred ten billion, four hundred twenty-one million, four hundred four thousand, three hundred thirty-one".