21122203 has 2 divisors, whose sum is σ = 21122204. Its totient is φ = 21122202.

The previous prime is 21122201. The next prime is 21122221. The reversal of 21122203 is 30222112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122203 - 2¹ = 21122201 is a prime.

It is a super-2 number, since 2×21122203² = 892294919146418, which contains 22 as substring.

Together with 21122201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21122201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561101 + 10561102.

It is an arithmetic number, because the mean of its divisors is an integer number (10561102).

Almost surely, 2^21122203 is an apocalyptic number.

21122203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122203 is an equidigital number, since it uses as much as digits as its factorization.

21122203 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 21122203 is about 4595.8897941530. The cubic root of 21122203 is about 276.4265397643.

Adding to 21122203 its reverse (30222112), we get a palindrome (51344315).

Subtracting 21122203 from its reverse (30222112), we obtain a palindrome (9099909).

The spelling of 21122203 in words is "twenty-one million, one hundred twenty-two thousand, two hundred three".