121215798 has 32 divisors (see below), whose sum is σ = 293857920. Its totient is φ = 36731880.

The previous prime is 121215793. The next prime is 121215799. The reversal of 121215798 is 897512121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101440 + ... + 102627.

It is an arithmetic number, because the mean of its divisors is an integer number (9183060).

Almost surely, 2^121215798 is an apocalyptic number.

121215798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121215798 is an abundant number, since it is smaller than the sum of its proper divisors (172642122).

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

121215798 is a wasteful number, since it uses less digits than its factorization.

121215798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204089 (or 204083 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 121215798 is about 11009.8046304192. The cubic root of 121215798 is about 494.9026071015.

The spelling of 121215798 in words is "one hundred twenty-one million, two hundred fifteen thousand, seven hundred ninety-eight".