21213100303221 has 16 divisors (see below), whose sum is σ = 28886983041024. Its totient is φ = 13840664284464.

The previous prime is 21213100303193. The next prime is 21213100303223. The reversal of 21213100303221 is 12230300131212.

It is not a de Polignac number, because 21213100303221 - 2²² = 21213096108917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213100303223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1119696 + ... + 6609078.

It is an arithmetic number, because the mean of its divisors is an integer number (1805436440064).

Almost surely, 2^{21213100303221} is an apocalyptic number.

It is an amenable number.

21213100303221 is a deficient number, since it is larger than the sum of its proper divisors (7673882737803).

21213100303221 is a wasteful number, since it uses less digits than its factorization.

21213100303221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516840.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21213100303221 its reverse (12230300131212), we get a palindrome (33443400434433).

The spelling of 21213100303221 in words is "twenty-one trillion, two hundred thirteen billion, one hundred million, three hundred three thousand, two hundred twenty-one".