21136003 has 10 divisors (see below), whose sum is σ = 24660004. Its totient is φ = 18114516.

The previous prime is 21135997. The next prime is 21136007. The reversal of 21136003 is 30063112.

It is not a de Polignac number, because 21136003 - 2⁵ = 21135971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21136007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2001 + ... + 6802.

Almost surely, 2^21136003 is an apocalyptic number.

21136003 is a deficient number, since it is larger than the sum of its proper divisors (3524001).

21136003 is an frugal number, since it uses more digits than its factorization.

21136003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831 (or 8810 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21136003 is about 4597.3908904943. The cubic root of 21136003 is about 276.4867269172.

Adding to 21136003 its reverse (30063112), we get a palindrome (51199115).

The spelling of 21136003 in words is "twenty-one million, one hundred thirty-six thousand, three".