21303313222221 has 24 divisors (see below), whose sum is σ = 31911608703520. Its totient is φ = 14201998371792.

The previous prime is 21303313222193. The next prime is 21303313222231. The reversal of 21303313222221 is 12222231330312.

21303313222221 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 331 + 322 + 2 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 21303313222221 - 2⁹ = 21303313221709 is a prime.

It is a super-3 number, since 3×21303313222221³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303313222231) 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, 16739550 + ... + 17967168.

Almost surely, 2^{21303313222221} is an apocalyptic number.

It is an amenable number.

21303313222221 is a deficient number, since it is larger than the sum of its proper divisors (10608295481299).

21303313222221 is an equidigital number, since it uses as much as digits as its factorization.

21303313222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299047 (or 1299035 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21303313222221 its reverse (12222231330312), we get a palindrome (33525544552533).

The spelling of 21303313222221 in words is "twenty-one trillion, three hundred three billion, three hundred thirteen million, two hundred twenty-two thousand, two hundred twenty-one".