121121556 has 24 divisors (see below), whose sum is σ = 283749984. Its totient is φ = 40212000.

The previous prime is 121121543. The next prime is 121121573. The reversal of 121121556 is 655121121.

It is a super-2 number, since 2×121121556² = 29340862655722272, which contains 22 as substring.

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, 17095 + ... + 23118.

It is an arithmetic number, because the mean of its divisors is an integer number (11822916).

Almost surely, 2^121121556 is an apocalyptic number.

It is an amenable number.

121121556 is an abundant number, since it is smaller than the sum of its proper divisors (162628428).

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

121121556 is a wasteful number, since it uses less digits than its factorization.

121121556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40471 (or 40469 counting only the distinct ones).

The product of its digits is 600, while the sum is 24.

The square root of 121121556 is about 11005.5238857585. The cubic root of 121121556 is about 494.7743160570.

Adding to 121121556 its reverse (655121121), we get a palindrome (776242677).

The spelling of 121121556 in words is "one hundred twenty-one million, one hundred twenty-one thousand, five hundred fifty-six".