21353002603 has 8 divisors (see below), whose sum is σ = 21705887520. Its totient is φ = 21000209280.

The previous prime is 21353002589. The next prime is 21353002607. The reversal of 21353002603 is 30620035312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21353002603 - 2⁹ = 21353002091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21353002607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574851 + ... + 610867.

It is an arithmetic number, because the mean of its divisors is an integer number (2713235940).

Almost surely, 2^21353002603 is an apocalyptic number.

21353002603 is a deficient number, since it is larger than the sum of its proper divisors (352884917).

21353002603 is an equidigital number, since it uses as much as digits as its factorization.

21353002603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45797.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 21353002603 its reverse (30620035312), we get a palindrome (51973037915).

The spelling of 21353002603 in words is "twenty-one billion, three hundred fifty-three million, two thousand, six hundred three".