21214303 has 16 divisors (see below), whose sum is σ = 24509952. Its totient is φ = 18172000.

The previous prime is 21214273. The next prime is 21214309. The reversal of 21214303 is 30341212.

It is a happy number.

It is not a de Polignac number, because 21214303 - 2²¹ = 19117151 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17373 + ... + 18553.

It is an arithmetic number, because the mean of its divisors is an integer number (1531872).

Almost surely, 2^21214303 is an apocalyptic number.

21214303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21214303 is a deficient number, since it is larger than the sum of its proper divisors (3295649).

21214303 is a wasteful number, since it uses less digits than its factorization.

21214303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21214303 is about 4605.8987179485. The cubic root of 21214303 is about 276.8277285126.

Adding to 21214303 its reverse (30341212), we get a palindrome (51555515).

The spelling of 21214303 in words is "twenty-one million, two hundred fourteen thousand, three hundred three".