21143203 has 2 divisors, whose sum is σ = 21143204. Its totient is φ = 21143202.

The previous prime is 21143201. The next prime is 21143207. The reversal of 21143203 is 30234112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21143203 - 2¹ = 21143201 is a prime.

Together with 21143201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21143201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571601 + 10571602.

It is an arithmetic number, because the mean of its divisors is an integer number (10571602).

Almost surely, 2^21143203 is an apocalyptic number.

21143203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143203 is an equidigital number, since it uses as much as digits as its factorization.

21143203 is an evil number, because the sum of its binary digits is even.

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

The square root of 21143203 is about 4598.1738766602. The cubic root of 21143203 is about 276.5181185105.

Adding to 21143203 its reverse (30234112), we get a palindrome (51377315).

Subtracting 21143203 from its reverse (30234112), we obtain a palindrome (9090909).

The spelling of 21143203 in words is "twenty-one million, one hundred forty-three thousand, two hundred three".