121535556 has 12 divisors (see below), whose sum is σ = 283582992. Its totient is φ = 40511848.

The previous prime is 121535551. The next prime is 121535569. The reversal of 121535556 is 655535121.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (121535551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5063970 + ... + 5063993.

It is an arithmetic number, because the mean of its divisors is an integer number (23631916).

Almost surely, 2^121535556 is an apocalyptic number.

It is an amenable number.

121535556 is an abundant number, since it is smaller than the sum of its proper divisors (162047436).

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

121535556 is a wasteful number, since it uses less digits than its factorization.

121535556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10127970 (or 10127968 counting only the distinct ones).

The product of its digits is 22500, while the sum is 33.

The square root of 121535556 is about 11024.3165774573. The cubic root of 121535556 is about 495.3373967477.

The spelling of 121535556 in words is "one hundred twenty-one million, five hundred thirty-five thousand, five hundred fifty-six".