21275225503 has 4 divisors (see below), whose sum is σ = 24314543440. Its totient is φ = 18235907568.

The previous prime is 21275225443. The next prime is 21275225527. The reversal of 21275225503 is 30552257212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21275225503 - 2²¹ = 21273128351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275225533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519658958 + ... + 1519658971.

It is an arithmetic number, because the mean of its divisors is an integer number (6078635860).

Almost surely, 2^21275225503 is an apocalyptic number.

21275225503 is a deficient number, since it is larger than the sum of its proper divisors (3039317937).

21275225503 is an equidigital number, since it uses as much as digits as its factorization.

21275225503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039317936.

The product of its (nonzero) digits is 42000, while the sum is 34.

The spelling of 21275225503 in words is "twenty-one billion, two hundred seventy-five million, two hundred twenty-five thousand, five hundred three".