121221010110 has 32 divisors (see below), whose sum is σ = 296419681440. Its totient is φ = 31715685248.

The previous prime is 121221010109. The next prime is 121221010117. The reversal of 121221010110 is 11010122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221010117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38118225 + ... + 38121404.

It is an arithmetic number, because the mean of its divisors is an integer number (9263115045).

Almost surely, 2^121221010110 is an apocalyptic number.

121221010110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221010110 is an abundant number, since it is smaller than the sum of its proper divisors (175198671330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221010110 is a wasteful number, since it uses less digits than its factorization.

121221010110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76239692.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121221010110 its reverse (11010122121), we get a palindrome (132231132231).

The spelling of 121221010110 in words is "one hundred twenty-one billion, two hundred twenty-one million, ten thousand, one hundred ten".