121121201110 has 128 divisors (see below), whose sum is σ = 272508364800. Its totient is φ = 37737584640.

The previous prime is 121121201087. The next prime is 121121201111. The reversal of 121121201110 is 11102121121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121201111) 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, 81343246 + ... + 81344734.

It is an arithmetic number, because the mean of its divisors is an integer number (2128971600).

Almost surely, 2^121121201110 is an apocalyptic number.

121121201110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121121201110 is an abundant number, since it is smaller than the sum of its proper divisors (151387163690).

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

121121201110 is a wasteful number, since it uses less digits than its factorization.

121121201110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846.

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

Adding to 121121201110 its reverse (11102121121), we get a palindrome (132223322231).

The spelling of 121121201110 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred ten".