121311235110 has 128 divisors (see below), whose sum is σ = 323469619200. Its totient is φ = 28923111936.

The previous prime is 121311235091. The next prime is 121311235117. The reversal of 121311235110 is 11532113121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311235117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3199041 + ... + 3236739.

It is an arithmetic number, because the mean of its divisors is an integer number (2527106400).

Almost surely, 2^121311235110 is an apocalyptic number.

121311235110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121311235110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161734809600).

121311235110 is an abundant number, since it is smaller than the sum of its proper divisors (202158384090).

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

121311235110 is a wasteful number, since it uses less digits than its factorization.

121311235110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37982.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 121311235110 its reverse (11532113121), we get a palindrome (132843348231).

The spelling of 121311235110 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred thirty-five thousand, one hundred ten".