21323214 has 24 divisors (see below), whose sum is σ = 50400792. Its totient is φ = 6461520.

The previous prime is 21323209. The next prime is 21323261. The reversal of 21323214 is 41232312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53649 + ... + 54044.

It is an arithmetic number, because the mean of its divisors is an integer number (2100033).

Almost surely, 2^21323214 is an apocalyptic number.

21323214 is an abundant number, since it is smaller than the sum of its proper divisors (29077578).

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

21323214 is a wasteful number, since it uses less digits than its factorization.

21323214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107712 (or 107709 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21323214 is about 4617.7065736142. The cubic root of 21323214 is about 277.3006505932.

Adding to 21323214 its reverse (41232312), we get a palindrome (62555526).

The spelling of 21323214 in words is "twenty-one million, three hundred twenty-three thousand, two hundred fourteen".