121004556 has 12 divisors (see below), whose sum is σ = 282343992. Its totient is φ = 40334848.

The previous prime is 121004551. The next prime is 121004561. The reversal of 121004556 is 655400121.

It is an interprime number because it is at equal distance from previous prime (121004551) and next prime (121004561).

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 (121004551) 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, 5041845 + ... + 5041868.

It is an arithmetic number, because the mean of its divisors is an integer number (23528666).

Almost surely, 2^121004556 is an apocalyptic number.

It is an amenable number.

121004556 is an abundant number, since it is smaller than the sum of its proper divisors (161339436).

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

121004556 is a wasteful number, since it uses less digits than its factorization.

121004556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10083720 (or 10083718 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 121004556 is about 11000.2070889597. The cubic root of 121004556 is about 494.6149520636.

Adding to 121004556 its reverse (655400121), we get a palindrome (776404677).

The spelling of 121004556 in words is "one hundred twenty-one million, four thousand, five hundred fifty-six".