21525422003 has 4 divisors (see below), whose sum is σ = 21575134728. Its totient is φ = 21475709280.

The previous prime is 21525421997. The next prime is 21525422021. The reversal of 21525422003 is 30022452512.

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 21525422003 - 2¹⁰ = 21525420979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21525422033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24855713 + ... + 24856578.

It is an arithmetic number, because the mean of its divisors is an integer number (5393783682).

Almost surely, 2^21525422003 is an apocalyptic number.

21525422003 is a deficient number, since it is larger than the sum of its proper divisors (49712725).

21525422003 is an equidigital number, since it uses as much as digits as its factorization.

21525422003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49712724.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21525422003 its reverse (30022452512), we get a palindrome (51547874515).

The spelling of 21525422003 in words is "twenty-one billion, five hundred twenty-five million, four hundred twenty-two thousand, three".