221012222212221 has 96 divisors (see below), whose sum is σ = 337453778350080. Its totient is φ = 127508772124800.

The previous prime is 221012222212213. The next prime is 221012222212231. The reversal of 221012222212221 is 122212222210122.

It is a happy number.

It is not a de Polignac number, because 221012222212221 - 2³ = 221012222212213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221012222212191 and 221012222212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012222212211) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8606717260 + ... + 8606742938.

It is an arithmetic number, because the mean of its divisors is an integer number (3515143524480).

Almost surely, 2^{221012222212221} is an apocalyptic number.

It is an amenable number.

221012222212221 is a deficient number, since it is larger than the sum of its proper divisors (116441556137859).

221012222212221 is a wasteful number, since it uses less digits than its factorization.

221012222212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29015 (or 28968 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 221012222212221 its reverse (122212222210122), we get a palindrome (343224444422343).

The spelling of 221012222212221 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".