121613128 has 32 divisors (see below), whose sum is σ = 280647360. Its totient is φ = 48110400.

The previous prime is 121613113. The next prime is 121613143. The reversal of 121613128 is 821316121.

It is an interprime number because it is at equal distance from previous prime (121613113) and next prime (121613143).

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, 82798 + ... + 84253.

It is an arithmetic number, because the mean of its divisors is an integer number (8770230).

Almost surely, 2^121613128 is an apocalyptic number.

It is an amenable number.

121613128 is an abundant number, since it is smaller than the sum of its proper divisors (159034232).

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

121613128 is a wasteful number, since it uses less digits than its factorization.

121613128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167077 (or 167073 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 121613128 is about 11027.8342388703. The cubic root of 121613128 is about 495.4427599893.

Adding to 121613128 its reverse (821316121), we get a palindrome (942929249).

The spelling of 121613128 in words is "one hundred twenty-one million, six hundred thirteen thousand, one hundred twenty-eight".