21252214 has 4 divisors (see below), whose sum is σ = 31878324. Its totient is φ = 10626106.

The previous prime is 21252211. The next prime is 21252223. The reversal of 21252214 is 41225212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21252191 and 21252200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313052 + ... + 5313055.

It is an arithmetic number, because the mean of its divisors is an integer number (7969581).

Almost surely, 2^21252214 is an apocalyptic number.

21252214 is a deficient number, since it is larger than the sum of its proper divisors (10626110).

21252214 is a wasteful number, since it uses less digits than its factorization.

21252214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10626109.

The product of its digits is 320, while the sum is 19.

The square root of 21252214 is about 4610.0123644086. The cubic root of 21252214 is about 276.9925319573.

Adding to 21252214 its reverse (41225212), we get a palindrome (62477426).

The spelling of 21252214 in words is "twenty-one million, two hundred fifty-two thousand, two hundred fourteen".