21221314 has 4 divisors (see below), whose sum is σ = 31831974. Its totient is φ = 10610656.

The previous prime is 21221303. The next prime is 21221339. The reversal of 21221314 is 41312212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16136289 + 5085025 = 4017^2 + 2255^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5305327 + ... + 5305330.

Almost surely, 2^21221314 is an apocalyptic number.

21221314 is a deficient number, since it is larger than the sum of its proper divisors (10610660).

21221314 is a wasteful number, since it uses less digits than its factorization.

21221314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610659.

The product of its digits is 96, while the sum is 16.

The square root of 21221314 is about 4606.6597443267. The cubic root of 21221314 is about 276.8582209189.

Adding to 21221314 its reverse (41312212), we get a palindrome (62533526).

The spelling of 21221314 in words is "twenty-one million, two hundred twenty-one thousand, three hundred fourteen".