21375503 has 2 divisors, whose sum is σ = 21375504. Its totient is φ = 21375502.

The previous prime is 21375493. The next prime is 21375517. The reversal of 21375503 is 30557312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21375503 - 2⁶ = 21375439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21372503) 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, 10687751 + 10687752.

It is an arithmetic number, because the mean of its divisors is an integer number (10687752).

Almost surely, 2^21375503 is an apocalyptic number.

21375503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21375503 is an equidigital number, since it uses as much as digits as its factorization.

21375503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 21375503 is about 4623.3649001566. The cubic root of 21375503 is about 277.5271320494.

The spelling of 21375503 in words is "twenty-one million, three hundred seventy-five thousand, five hundred three".