21414210 has 16 divisors (see below), whose sum is σ = 51394176. Its totient is φ = 5710448.

The previous prime is 21414193. The next prime is 21414221. The reversal of 21414210 is 1241412.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21414210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356874 + ... + 356933.

It is an arithmetic number, because the mean of its divisors is an integer number (3212136).

Almost surely, 2^21414210 is an apocalyptic number.

21414210 is an abundant number, since it is smaller than the sum of its proper divisors (29979966).

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

21414210 is a wasteful number, since it uses less digits than its factorization.

21414210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713817.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21414210 is about 4627.5490272930. The cubic root of 21414210 is about 277.6945474494.

Adding to 21414210 its reverse (1241412), we get a palindrome (22655622).

The spelling of 21414210 in words is "twenty-one million, four hundred fourteen thousand, two hundred ten".