121122220110 has 128 divisors (see below), whose sum is σ = 312188152320. Its totient is φ = 29984587776.

The previous prime is 121122220073. The next prime is 121122220147. The reversal of 121122220110 is 11022221121.

It is an interprime number because it is at equal distance from previous prime (121122220073) and next prime (121122220147).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121122220110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7362454 + ... + 7378886.

It is an arithmetic number, because the mean of its divisors is an integer number (2438969940).

Almost surely, 2^121122220110 is an apocalyptic number.

121122220110 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 121122220110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156094076160).

121122220110 is an abundant number, since it is smaller than the sum of its proper divisors (191065932210).

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

121122220110 is a wasteful number, since it uses less digits than its factorization.

121122220110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16722.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121122220110 its reverse (11022221121), we get a palindrome (132144441231).

The spelling of 121122220110 in words is "one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred ten".