221220122101 has 16 divisors (see below), whose sum is σ = 250002556416. Its totient is φ = 193929120000.

The previous prime is 221220122027. The next prime is 221220122107. The reversal of 221220122101 is 101221022122.

It is a happy number.

It is not a de Polignac number, because 221220122101 - 2⁹ = 221220121589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220122107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058520 + ... + 1250161.

It is an arithmetic number, because the mean of its divisors is an integer number (15625159776).

Almost surely, 2^221220122101 is an apocalyptic number.

It is an amenable number.

221220122101 is a deficient number, since it is larger than the sum of its proper divisors (28782434315).

221220122101 is a wasteful number, since it uses less digits than its factorization.

221220122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309004.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221220122101 its reverse (101221022122), we get a palindrome (322441144223).

The spelling of 221220122101 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, one hundred one".