21301003 has 4 divisors (see below), whose sum is σ = 21431848. Its totient is φ = 21170160.

The previous prime is 21300997. The next prime is 21301031. The reversal of 21301003 is 30010312.

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 21301003 - 2⁹ = 21300491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301043) 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, 65178 + ... + 65503.

It is an arithmetic number, because the mean of its divisors is an integer number (5357962).

Almost surely, 2^21301003 is an apocalyptic number.

21301003 is a deficient number, since it is larger than the sum of its proper divisors (130845).

21301003 is a wasteful number, since it uses less digits than its factorization.

21301003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130844.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21301003 is about 4615.3009652676. The cubic root of 21301003 is about 277.2043351486.

Adding to 21301003 its reverse (30010312), we get a palindrome (51311315).

The spelling of 21301003 in words is "twenty-one million, three hundred one thousand, three".