121211111010 has 128 divisors (see below), whose sum is σ = 321492354048. Its totient is φ = 29003040000.

The previous prime is 121211110903. The next prime is 121211111017. The reversal of 121211111010 is 10111112121.

121211111010 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (121211111017) 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, 11026737 + ... + 11037723.

It is an arithmetic number, because the mean of its divisors is an integer number (2511659016).

Almost surely, 2^121211111010 is an apocalyptic number.

121211111010 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 121211111010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160746177024).

121211111010 is an abundant number, since it is smaller than the sum of its proper divisors (200281243038).

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

121211111010 is a wasteful number, since it uses less digits than its factorization.

121211111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11440.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121211111010 its reverse (10111112121), we get a palindrome (131322223131).

It can be divided in two parts, 12121111 and 1010, that added together give a palindrome (12122121).

The spelling of 121211111010 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, ten".