21221003003 has 8 divisors (see below), whose sum is σ = 21660922800. Its totient is φ = 20783758048.

The previous prime is 21221002993. The next prime is 21221003021. The reversal of 21221003003 is 30030012212.

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 21221003003 - 2⁴ = 21221002987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221003053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652676 + ... + 684417.

It is an arithmetic number, because the mean of its divisors is an integer number (2707615350).

Almost surely, 2^21221003003 is an apocalyptic number.

21221003003 is a deficient number, since it is larger than the sum of its proper divisors (439919797).

21221003003 is a wasteful number, since it uses less digits than its factorization.

21221003003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337421.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21221003003 its reverse (30030012212), we get a palindrome (51251015215).

The spelling of 21221003003 in words is "twenty-one billion, two hundred twenty-one million, three thousand, three".