121311223110 has 192 divisors, whose sum is σ = 393498653184. Its totient is φ = 25190784000.

The previous prime is 121311223093. The next prime is 121311223127. The reversal of 121311223110 is 11322113121.

121311223110 is a `hidden beast` number, since 1 + 21 + 311 + 22 + 311 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (121311223093) and next prime (121311223127).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12309685 + ... + 12319535.

It is an arithmetic number, because the mean of its divisors is an integer number (2049472152).

Almost surely, 2^121311223110 is an apocalyptic number.

121311223110 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 121311223110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196749326592).

121311223110 is an abundant number, since it is smaller than the sum of its proper divisors (272187430074).

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

121311223110 is a wasteful number, since it uses less digits than its factorization.

121311223110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11659 (or 11656 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121311223110 its reverse (11322113121), we get a palindrome (132633336231).

The spelling of 121311223110 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred twenty-three thousand, one hundred ten".