121221110110 has 16 divisors (see below), whose sum is σ = 219916094976. Its totient is φ = 48106644768.

The previous prime is 121221110107. The next prime is 121221110147. The reversal of 121221110110 is 11011122121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47723577 + ... + 47726116.

It is an arithmetic number, because the mean of its divisors is an integer number (13744755936).

Almost surely, 2^121221110110 is an apocalyptic number.

121221110110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221110110 is a deficient number, since it is larger than the sum of its proper divisors (98694984866).

121221110110 is a wasteful number, since it uses less digits than its factorization.

121221110110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95449827.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121221110110 its reverse (11011122121), we get a palindrome (132232232231).

The spelling of 121221110110 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred ten".