210143421 has 24 divisors (see below), whose sum is σ = 308975160. Its totient is φ = 137604096.

The previous prime is 210143383. The next prime is 210143431. The reversal of 210143421 is 124341012.

210143421 is a `hidden beast` number, since 210 + 1 + 434 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 617796 + 209525625 = 786^2 + 14475^2 .

It is not a de Polignac number, because 210143421 - 2⁷ = 210143293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210143394 and 210143403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210143431) 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 23 ways as a sum of consecutive naturals, for example, 207765 + ... + 208773.

It is an arithmetic number, because the mean of its divisors is an integer number (12873965).

Almost surely, 2^210143421 is an apocalyptic number.

It is an amenable number.

210143421 is a deficient number, since it is larger than the sum of its proper divisors (98831739).

210143421 is a wasteful number, since it uses less digits than its factorization.

210143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1402 counting only the distinct ones).

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

The square root of 210143421 is about 14496.3243962047. The cubic root of 210143421 is about 594.5274792817.

Adding to 210143421 its reverse (124341012), we get a palindrome (334484433).

The spelling of 210143421 in words is "two hundred ten million, one hundred forty-three thousand, four hundred twenty-one".