21224214 has 32 divisors (see below), whose sum is σ = 51454080. Its totient is φ = 6431400.

The previous prime is 21224207. The next prime is 21224249. The reversal of 21224214 is 41242212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 17272 + ... + 18459.

It is an arithmetic number, because the mean of its divisors is an integer number (1607940).

Almost surely, 2^21224214 is an apocalyptic number.

21224214 is an abundant number, since it is smaller than the sum of its proper divisors (30229866).

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

21224214 is a wasteful number, since it uses less digits than its factorization.

21224214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35753 (or 35747 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 21224214 is about 4606.9744952626. The cubic root of 21224214 is about 276.8708317037.

Adding to 21224214 its reverse (41242212), we get a palindrome (62466426).

It can be divided in two parts, 2122 and 4214, that added together give a palindrome (6336).

The spelling of 21224214 in words is "twenty-one million, two hundred twenty-four thousand, two hundred fourteen".