121204428 has 24 divisors (see below), whose sum is σ = 288147888. Its totient is φ = 39638976.

The previous prime is 121204423. The next prime is 121204453. The reversal of 121204428 is 824402121.

121204428 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

121204428 is a modest number, since divided by 4428 gives 1212 as remainder.

121204428 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 121204398 and 121204407.

It is not an unprimeable number, because it can be changed into a prime (121204423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94651 + ... + 95922.

It is an arithmetic number, because the mean of its divisors is an integer number (12006162).

Almost surely, 2^121204428 is an apocalyptic number.

It is an amenable number.

121204428 is an abundant number, since it is smaller than the sum of its proper divisors (166943460).

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

121204428 is a wasteful number, since it uses less digits than its factorization.

121204428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190633 (or 190631 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 121204428 is about 11009.2882603736. The cubic root of 121204428 is about 494.8871327198.

Adding to 121204428 its reverse (824402121), we get a palindrome (945606549).

The spelling of 121204428 in words is "one hundred twenty-one million, two hundred four thousand, four hundred twenty-eight".