221211102022221 has 128 divisors (see below), whose sum is σ = 337339301045760. Its totient is φ = 128214813081600.

The previous prime is 221211102022151. The next prime is 221211102022259. The reversal of 221211102022221 is 122220201112122.

It is not a de Polignac number, because 221211102022221 - 2⁷ = 221211102022093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211102022271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14056743865 + ... + 14056759601.

It is an arithmetic number, because the mean of its divisors is an integer number (2635463289420).

Almost surely, 2^{221211102022221} is an apocalyptic number.

It is an amenable number.

221211102022221 is a deficient number, since it is larger than the sum of its proper divisors (116128199023539).

221211102022221 is a wasteful number, since it uses less digits than its factorization.

221211102022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20095.

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

Adding to 221211102022221 its reverse (122220201112122), we get a palindrome (343431303134343).

The spelling of 221211102022221 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred two million, twenty-two thousand, two hundred twenty-one".