21214324 has 6 divisors (see below), whose sum is σ = 37125074. Its totient is φ = 10607160.

The previous prime is 21214321. The next prime is 21214327. The reversal of 21214324 is 42341212.

It is an interprime number because it is at equal distance from previous prime (21214321) and next prime (21214327).

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 964324 = 4500^2 + 982^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651787 + ... + 2651794.

Almost surely, 2^21214324 is an apocalyptic number.

It is an amenable number.

21214324 is a deficient number, since it is larger than the sum of its proper divisors (15910750).

21214324 is a wasteful number, since it uses less digits than its factorization.

21214324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303585 (or 5303583 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21214324 is about 4605.9009976334. The cubic root of 21214324 is about 276.8278198564.

Adding to 21214324 its reverse (42341212), we get a palindrome (63555536).

The spelling of 21214324 in words is "twenty-one million, two hundred fourteen thousand, three hundred twenty-four".