121136556 has 12 divisors (see below), whose sum is σ = 282651992. Its totient is φ = 40378848.

The previous prime is 121136551. The next prime is 121136563. The reversal of 121136556 is 655631121.

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

It is a super-2 number, since 2×121136556² = 29348130399082272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (121136551) 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, 5047345 + ... + 5047368.

Almost surely, 2^121136556 is an apocalyptic number.

It is an amenable number.

121136556 is an abundant number, since it is smaller than the sum of its proper divisors (161515436).

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

121136556 is a wasteful number, since it uses less digits than its factorization.

121136556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10094720 (or 10094718 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 121136556 is about 11006.2053406249. The cubic root of 121136556 is about 494.7947399151.

Adding to 121136556 its reverse (655631121), we get a palindrome (776767677).

The spelling of 121136556 in words is "one hundred twenty-one million, one hundred thirty-six thousand, five hundred fifty-six".