21135003 has 8 divisors (see below), whose sum is σ = 28217616. Its totient is φ = 14071200.

The previous prime is 21135001. The next prime is 21135013. The reversal of 21135003 is 30053112.

It is a happy number.

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

It is not a de Polignac number, because 21135003 - 2¹ = 21135001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21135001) 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, 1828 + ... + 6753.

It is an arithmetic number, because the mean of its divisors is an integer number (3527202).

Almost surely, 2^21135003 is an apocalyptic number.

21135003 is a deficient number, since it is larger than the sum of its proper divisors (7082613).

21135003 is an equidigital number, since it uses as much as digits as its factorization.

21135003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9405.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 21135003 is about 4597.2821318688. The cubic root of 21135003 is about 276.4823664099.

Adding to 21135003 its reverse (30053112), we get a palindrome (51188115).

The spelling of 21135003 in words is "twenty-one million, one hundred thirty-five thousand, three".