121112111010 has 128 divisors (see below), whose sum is σ = 334218389760. Its totient is φ = 27813094400.

The previous prime is 121112110969. The next prime is 121112111077. The reversal of 121112111010 is 10111211121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 387820 + ... + 626600.

It is an arithmetic number, because the mean of its divisors is an integer number (2611081170).

Almost surely, 2^121112111010 is an apocalyptic number.

121112111010 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 121112111010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167109194880).

121112111010 is an abundant number, since it is smaller than the sum of its proper divisors (213106278750).

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

121112111010 is a wasteful number, since it uses less digits than its factorization.

121112111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238884.

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

Adding to 121112111010 its reverse (10111211121), we get a palindrome (131223322131).

The spelling of 121112111010 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, ten".