21885203 has 2 divisors, whose sum is σ = 21885204. Its totient is φ = 21885202.

The previous prime is 21885187. The next prime is 21885217. The reversal of 21885203 is 30258812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21885203 - 2⁴ = 21885187 is a prime.

It is a super-2 number, since 2×21885203² = 957924220702418, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_1382429 and since 21885203 and 1382429 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21885223) 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, 10942601 + 10942602.

It is an arithmetic number, because the mean of its divisors is an integer number (10942602).

Almost surely, 2^21885203 is an apocalyptic number.

21885203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21885203 is an equidigital number, since it uses as much as digits as its factorization.

21885203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 21885203 is about 4678.1623528903. The cubic root of 21885203 is about 279.7157106028.

The spelling of 21885203 in words is "twenty-one million, eight hundred eighty-five thousand, two hundred three".