221121102111 has 64 divisors (see below), whose sum is σ = 373000470528. Its totient is φ = 113383162368.

The previous prime is 221121102071. The next prime is 221121102121. The reversal of 221121102111 is 111201121122.

It is a happy number.

It is not a de Polignac number, because 221121102111 - 2⁶ = 221121102047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121102121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12243490 + ... + 12261536.

It is an arithmetic number, because the mean of its divisors is an integer number (5828132352).

Almost surely, 2^221121102111 is an apocalyptic number.

221121102111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221121102111 is a deficient number, since it is larger than the sum of its proper divisors (151879368417).

221121102111 is a wasteful number, since it uses less digits than its factorization.

221121102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19320.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221121102111 its reverse (111201121122), we get a palindrome (332322223233).

The spelling of 221121102111 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred two thousand, one hundred eleven".