21336223221 has 24 divisors (see below), whose sum is σ = 31140844800. Its totient is φ = 14076309600.

The previous prime is 21336223199. The next prime is 21336223229. The reversal of 21336223221 is 12232263312.

21336223221 is a `hidden beast` number, since 2 + 1 + 3 + 3 + 622 + 32 + 2 + 1 = 666.

It is not a de Polignac number, because 21336223221 - 2⁵ = 21336223189 is a prime.

It is a super-2 number, since 2×21336223221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21336223229) 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, 334056 + ... + 392766.

It is an arithmetic number, because the mean of its divisors is an integer number (1297535200).

Almost surely, 2^21336223221 is an apocalyptic number.

It is an amenable number.

21336223221 is a deficient number, since it is larger than the sum of its proper divisors (9804621579).

21336223221 is a wasteful number, since it uses less digits than its factorization.

21336223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59137 (or 59134 counting only the distinct ones).

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

Adding to 21336223221 its reverse (12232263312), we get a palindrome (33568486533).

The spelling of 21336223221 in words is "twenty-one billion, three hundred thirty-six million, two hundred twenty-three thousand, two hundred twenty-one".