23201212221 has 12 divisors (see below), whose sum is σ = 36559486080. Its totient is φ = 14061340680.

The previous prime is 23201212219. The next prime is 23201212259. The reversal of 23201212221 is 12221210232.

23201212221 is a `hidden beast` number, since 2 + 320 + 121 + 2 + 221 = 666.

It is not a de Polignac number, because 23201212221 - 2¹ = 23201212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23201212194 and 23201212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23201212921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117177741 + ... + 117177938.

It is an arithmetic number, because the mean of its divisors is an integer number (3046623840).

Almost surely, 2^23201212221 is an apocalyptic number.

It is an amenable number.

23201212221 is a deficient number, since it is larger than the sum of its proper divisors (13358273859).

23201212221 is a wasteful number, since it uses less digits than its factorization.

23201212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234355696 (or 234355693 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 23201212221 its reverse (12221210232), we get a palindrome (35422422453).

The spelling of 23201212221 in words is "twenty-three billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".