121798110 has 128 divisors (see below), whose sum is σ = 353009664. Its totient is φ = 26294400.

The previous prime is 121798109. The next prime is 121798111. The reversal of 121798110 is 11897121.

It is an interprime number because it is at equal distance from previous prime (121798109) and next prime (121798111).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121798111) by changing a digit.

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, 729247 + ... + 729413.

It is an arithmetic number, because the mean of its divisors is an integer number (2757888).

Almost surely, 2^121798110 is an apocalyptic number.

121798110 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 121798110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176504832).

121798110 is an abundant number, since it is smaller than the sum of its proper divisors (231211554).

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

121798110 is a wasteful number, since it uses less digits than its factorization.

121798110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its (nonzero) digits is 1008, while the sum is 30.

The square root of 121798110 is about 11036.2181022305. The cubic root of 121798110 is about 495.6938336623.

The spelling of 121798110 in words is "one hundred twenty-one million, seven hundred ninety-eight thousand, one hundred ten".