21300022221 has 16 divisors (see below), whose sum is σ = 29329471488. Its totient is φ = 13735710000.

The previous prime is 21300022213. The next prime is 21300022243. The reversal of 21300022221 is 12222000312.

It is a happy number.

It is not a de Polignac number, because 21300022221 - 2³ = 21300022213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21300022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300021221) 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 15 ways as a sum of consecutive naturals, for example, 158470 + ... + 260216.

It is an arithmetic number, because the mean of its divisors is an integer number (1833091968).

Almost surely, 2^21300022221 is an apocalyptic number.

It is an amenable number.

21300022221 is a deficient number, since it is larger than the sum of its proper divisors (8029449267).

21300022221 is a wasteful number, since it uses less digits than its factorization.

21300022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104032.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21300022221 its reverse (12222000312), we get a palindrome (33522022533).

The spelling of 21300022221 in words is "twenty-one billion, three hundred million, twenty-two thousand, two hundred twenty-one".