221001220102111 has 16 divisors (see below), whose sum is σ = 241687539007200. Its totient is φ = 201282339944448.

The previous prime is 221001220102081. The next prime is 221001220102129. The reversal of 221001220102111 is 111201022100122.

It is a de Polignac number, because none of the positive numbers 2^k-221001220102111 is a prime.

It is a super-2 number, since 2×221001220102111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221701220102111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 860582226 + ... + 860838991.

It is an arithmetic number, because the mean of its divisors is an integer number (15105471187950).

Almost surely, 2^{221001220102111} is an apocalyptic number.

221001220102111 is a deficient number, since it is larger than the sum of its proper divisors (20686318905089).

221001220102111 is a wasteful number, since it uses less digits than its factorization.

221001220102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721421498.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221001220102111 its reverse (111201022100122), we get a palindrome (332202242202233).

The spelling of 221001220102111 in words is "two hundred twenty-one trillion, one billion, two hundred twenty million, one hundred two thousand, one hundred eleven".