21130322221 has 8 divisors (see below), whose sum is σ = 21198276000. Its totient is φ = 21062443248.

The previous prime is 21130322219. The next prime is 21130322231. The reversal of 21130322221 is 12222303112.

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 21130322221 - 2¹ = 21130322219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130322231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577350 + ... + 612856.

It is an arithmetic number, because the mean of its divisors is an integer number (2649784500).

Almost surely, 2^21130322221 is an apocalyptic number.

It is an amenable number.

21130322221 is a deficient number, since it is larger than the sum of its proper divisors (67953779).

21130322221 is a wasteful number, since it uses less digits than its factorization.

21130322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37403.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21130322221 its reverse (12222303112), we get a palindrome (33352625333).

The spelling of 21130322221 in words is "twenty-one billion, one hundred thirty million, three hundred twenty-two thousand, two hundred twenty-one".