221102122221 has 48 divisors (see below), whose sum is σ = 329182788480. Its totient is φ = 142902195840.

The previous prime is 221102122211. The next prime is 221102122343. The reversal of 221102122221 is 122221201122.

It is a happy number.

221102122221 is a `hidden beast` number, since 221 + 10 + 212 + 2 + 221 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-221102122221 is a prime.

It is a super-2 number, since 2×221102122221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221102122194 and 221102122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102122211) 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 47 ways as a sum of consecutive naturals, for example, 171263586 + ... + 171264876.

It is an arithmetic number, because the mean of its divisors is an integer number (6857974760).

Almost surely, 2^221102122221 is an apocalyptic number.

It is an amenable number.

221102122221 is a deficient number, since it is larger than the sum of its proper divisors (108080666259).

221102122221 is a wasteful number, since it uses less digits than its factorization.

221102122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786 (or 2783 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221102122221 its reverse (122221201122), we get a palindrome (343323323343).

The spelling of 221102122221 in words is "two hundred twenty-one billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-one".