21952003 has 2 divisors, whose sum is σ = 21952004. Its totient is φ = 21952002.

The previous prime is 21951997. The next prime is 21952019. The reversal of 21952003 is 30025912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21952003 - 2⁵ = 21951971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21952033) 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, 10976001 + 10976002.

It is an arithmetic number, because the mean of its divisors is an integer number (10976002).

Almost surely, 2^21952003 is an apocalyptic number.

21952003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21952003 is an equidigital number, since it uses as much as digits as its factorization.

21952003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 21952003 is about 4685.2964687413. The cubic root of 21952003 is about 280.0000127551. Note that the first 4 decimals are identical.

Adding to 21952003 its reverse (30025912), we get a palindrome (51977915).

The spelling of 21952003 in words is "twenty-one million, nine hundred fifty-two thousand, three".