21021221002203 has 24 divisors (see below), whose sum is σ = 30399996186560. Its totient is φ = 13997535713280.

The previous prime is 21021221002157. The next prime is 21021221002237. The reversal of 21021221002203 is 30220012212012.

21021221002203 is a `hidden beast` number, since 21 + 0 + 212 + 210 + 0 + 220 + 3 = 666.

It is not a de Polignac number, because 21021221002203 - 2⁹ = 21021221001691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021221002303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29438625 + ... + 30144237.

Almost surely, 2^{21021221002203} is an apocalyptic number.

21021221002203 is a deficient number, since it is larger than the sum of its proper divisors (9378775184357).

21021221002203 is a wasteful number, since it uses less digits than its factorization.

21021221002203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709539 (or 709536 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21021221002203 its reverse (30220012212012), we get a palindrome (51241233214215).

The spelling of 21021221002203 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-one million, two thousand, two hundred three".