100121518 has 16 divisors (see below), whose sum is σ = 172893024. Its totient is φ = 42595200.

The previous prime is 100121473. The next prime is 100121521. The reversal of 100121518 is 815121001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 100121495 and 100121504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24183 + ... + 28018.

It is an arithmetic number, because the mean of its divisors is an integer number (10805814).

Almost surely, 2^100121518 is an apocalyptic number.

100121518 is a deficient number, since it is larger than the sum of its proper divisors (72771506).

100121518 is a wasteful number, since it uses less digits than its factorization.

100121518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52347.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 100121518 is about 10006.0740552926. The cubic root of 100121518 is about 464.3468194537.

Adding to 100121518 its reverse (815121001), we get a palindrome (915242519).

The spelling of 100121518 in words is "one hundred million, one hundred twenty-one thousand, five hundred eighteen".