121121110 has 64 divisors (see below), whose sum is σ = 252046080. Its totient is φ = 41489280.

The previous prime is 121121083. The next prime is 121121113. The reversal of 121121110 is 11121121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136729 + ... + 137611.

It is an arithmetic number, because the mean of its divisors is an integer number (3938220).

Almost surely, 2^121121110 is an apocalyptic number.

121121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121121110 is an abundant number, since it is smaller than the sum of its proper divisors (130924970).

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

121121110 is a wasteful number, since it uses less digits than its factorization.

121121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 121121110 is about 11005.5036231878. The cubic root of 121121110 is about 494.7737087619.

Adding to 121121110 its reverse (11121121), we get a palindrome (132242231).

The spelling of 121121110 in words is "one hundred twenty-one million, one hundred twenty-one thousand, one hundred ten".