210421434 has 32 divisors (see below), whose sum is σ = 444455424. Its totient is φ = 66278960.

The previous prime is 210421433. The next prime is 210421439. The reversal of 210421434 is 434124012.

210421434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 210421434.

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 15 ways as a sum of consecutive naturals, for example, 2269 + ... + 20639.

It is an arithmetic number, because the mean of its divisors is an integer number (13889232).

Almost surely, 2^210421434 is an apocalyptic number.

210421434 is an abundant number, since it is smaller than the sum of its proper divisors (234033990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210421434 is a wasteful number, since it uses less digits than its factorization.

210421434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18482.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 210421434 is about 14505.9103126967. The cubic root of 210421434 is about 594.7895440045.

Adding to 210421434 its reverse (434124012), we get a palindrome (644545446).

The spelling of 210421434 in words is "two hundred ten million, four hundred twenty-one thousand, four hundred thirty-four".