21214003 has 2 divisors, whose sum is σ = 21214004. Its totient is φ = 21214002.

The previous prime is 21214001. The next prime is 21214021. The reversal of 21214003 is 30041212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21214003 - 2¹ = 21214001 is a prime.

Together with 21214001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21214001) by changing a digit.

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 as a sum of consecutive naturals, namely, 10607001 + 10607002.

It is an arithmetic number, because the mean of its divisors is an integer number (10607002).

Almost surely, 2^21214003 is an apocalyptic number.

21214003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214003 is an equidigital number, since it uses as much as digits as its factorization.

21214003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21214003 is about 4605.8661508993. The cubic root of 21214003 is about 276.8264235957.

Adding to 21214003 its reverse (30041212), we get a palindrome (51255215).

The spelling of 21214003 in words is "twenty-one million, two hundred fourteen thousand, three".