21201022003 has 8 divisors (see below), whose sum is σ = 24271736672. Its totient is φ = 18140806656.

The previous prime is 21201021991. The next prime is 21201022033. The reversal of 21201022003 is 30022010212.

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

It is not a de Polignac number, because 21201022003 - 2⁵ = 21201021971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201022033) 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, 2620500 + ... + 2628577.

It is an arithmetic number, because the mean of its divisors is an integer number (3033967084).

Almost surely, 2^21201022003 is an apocalyptic number.

21201022003 is a deficient number, since it is larger than the sum of its proper divisors (3070714669).

21201022003 is an equidigital number, since it uses as much as digits as its factorization.

21201022003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249661.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21201022003 its reverse (30022010212), we get a palindrome (51223032215).

The spelling of 21201022003 in words is "twenty-one billion, two hundred one million, twenty-two thousand, three".