21214353 has 4 divisors (see below), whose sum is σ = 28285808. Its totient is φ = 14142900.

The previous prime is 21214327. The next prime is 21214373. The reversal of 21214353 is 35341212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21214353 - 2⁵ = 21214321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21214373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535723 + ... + 3535728.

It is an arithmetic number, because the mean of its divisors is an integer number (7071452).

Almost surely, 2^21214353 is an apocalyptic number.

It is an amenable number.

21214353 is a deficient number, since it is larger than the sum of its proper divisors (7071455).

21214353 is an equidigital number, since it uses as much as digits as its factorization.

21214353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071454.

The product of its digits is 720, while the sum is 21.

The square root of 21214353 is about 4605.9041457677. The cubic root of 21214353 is about 276.8279459976.

Adding to 21214353 its reverse (35341212), we get a palindrome (56555565).

The spelling of 21214353 in words is "twenty-one million, two hundred fourteen thousand, three hundred fifty-three".