121128156 has 24 divisors (see below), whose sum is σ = 314036240. Its totient is φ = 40376016.

The previous prime is 121128149. The next prime is 121128181. The reversal of 121128156 is 651821121.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560671 + ... + 560886.

Almost surely, 2^121128156 is an apocalyptic number.

It is an amenable number.

121128156 is an abundant number, since it is smaller than the sum of its proper divisors (192908084).

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

121128156 is a wasteful number, since it uses less digits than its factorization.

121128156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121570 (or 1121562 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 121128156 is about 11005.8237310980. The cubic root of 121128156 is about 494.7833027623.

Adding to 121128156 its reverse (651821121), we get a palindrome (772949277).

The spelling of 121128156 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, one hundred fifty-six".