121178428 has 48 divisors (see below), whose sum is σ = 256211200. Its totient is φ = 48988800.

The previous prime is 121178413. The next prime is 121178471. The reversal of 121178428 is 824871121.

It is a super-2 number, since 2×121178428² = 29368422825102368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121178393 and 121178402.

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 15 ways as a sum of consecutive naturals, for example, 201328 + ... + 201928.

Almost surely, 2^121178428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121178428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128105600).

121178428 is an abundant number, since it is smaller than the sum of its proper divisors (135032772).

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

121178428 is a wasteful number, since it uses less digits than its factorization.

121178428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010 (or 1008 counting only the distinct ones).

The product of its digits is 7168, while the sum is 34.

The square root of 121178428 is about 11008.1073759298. The cubic root of 121178428 is about 494.8517435132.

The spelling of 121178428 in words is "one hundred twenty-one million, one hundred seventy-eight thousand, four hundred twenty-eight".