21221221122201 has 32 divisors (see below), whose sum is σ = 29388801175552. Its totient is φ = 13606231193280.

The previous prime is 21221221122191. The next prime is 21221221122223. The reversal of 21221221122201 is 10222112212212.

It is not a de Polignac number, because 21221221122201 - 2⁹ = 21221221121689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221221122271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297126171 + ... + 297197583.

It is an arithmetic number, because the mean of its divisors is an integer number (918400036736).

Almost surely, 2^{21221221122201} is an apocalyptic number.

It is an amenable number.

21221221122201 is a deficient number, since it is larger than the sum of its proper divisors (8167580053351).

21221221122201 is a wasteful number, since it uses less digits than its factorization.

21221221122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91213.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21221221122201 its reverse (10222112212212), we get a palindrome (31443333334413).

The spelling of 21221221122201 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred one".