21434210 has 32 divisors (see below), whose sum is σ = 45124992. Its totient is φ = 7176960.

The previous prime is 21434177. The next prime is 21434213. The reversal of 21434210 is 1243412.

It is not an unprimeable number, because it can be changed into a prime (21434213) 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, 551 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (1410156).

Almost surely, 2^21434210 is an apocalyptic number.

21434210 is an abundant number, since it is smaller than the sum of its proper divisors (23690782).

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

21434210 is a wasteful number, since it uses less digits than its factorization.

21434210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21434210 is about 4629.7094941260. The cubic root of 21434210 is about 277.7809723484.

Adding to 21434210 its reverse (1243412), we get a palindrome (22677622).

The spelling of 21434210 in words is "twenty-one million, four hundred thirty-four thousand, two hundred ten".