21352214 has 16 divisors (see below), whose sum is σ = 34760880. Its totient is φ = 9778080.

The previous prime is 21352213. The next prime is 21352217. The reversal of 21352214 is 41225312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352213) 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 7 ways as a sum of consecutive naturals, for example, 272 + ... + 6540.

It is an arithmetic number, because the mean of its divisors is an integer number (2172555).

Almost surely, 2^21352214 is an apocalyptic number.

21352214 is a deficient number, since it is larger than the sum of its proper divisors (13408666).

21352214 is a wasteful number, since it uses less digits than its factorization.

21352214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6415.

The product of its digits is 480, while the sum is 20.

The square root of 21352214 is about 4620.8455936116. The cubic root of 21352214 is about 277.4263051339.

Adding to 21352214 its reverse (41225312), we get a palindrome (62577526).

The spelling of 21352214 in words is "twenty-one million, three hundred fifty-two thousand, two hundred fourteen".