210421431 has 12 divisors (see below), whose sum is σ = 331573320. Its totient is φ = 127528080.

The previous prime is 210421429. The next prime is 210421433. The reversal of 210421431 is 134124012.

210421431 is a `hidden beast` number, since 210 + 4 + 21 + 431 = 666.

It is an interprime number because it is at equal distance from previous prime (210421429) and next prime (210421433).

It is not a de Polignac number, because 210421431 - 2¹ = 210421429 is a prime.

It is a super-2 number, since 2×210421431² = 88554357248175522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210421433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1062636 + ... + 1062833.

It is an arithmetic number, because the mean of its divisors is an integer number (27631110).

Almost surely, 2^210421431 is an apocalyptic number.

210421431 is a deficient number, since it is larger than the sum of its proper divisors (121151889).

210421431 is a wasteful number, since it uses less digits than its factorization.

210421431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125486 (or 2125483 counting only the distinct ones).

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

The square root of 210421431 is about 14505.9102092906. The cubic root of 210421431 is about 594.7895411779.

Adding to 210421431 its reverse (134124012), we get a palindrome (344545443).

The spelling of 210421431 in words is "two hundred ten million, four hundred twenty-one thousand, four hundred thirty-one".