21130203221 has 8 divisors (see below), whose sum is σ = 22375510080. Its totient is φ = 19898215488.

The previous prime is 21130203217. The next prime is 21130203223. The reversal of 21130203221 is 12230203112.

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 21130203221 - 2² = 21130203217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21130203221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130203223) 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, 3326516 + ... + 3332861.

It is an arithmetic number, because the mean of its divisors is an integer number (2796938760).

Almost surely, 2^21130203221 is an apocalyptic number.

It is an amenable number.

21130203221 is a deficient number, since it is larger than the sum of its proper divisors (1245306859).

21130203221 is a wasteful number, since it uses less digits than its factorization.

21130203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659563.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130203221 its reverse (12230203112), we get a palindrome (33360406333).

The spelling of 21130203221 in words is "twenty-one billion, one hundred thirty million, two hundred three thousand, two hundred twenty-one".