280121212 has 12 divisors (see below), whose sum is σ = 560242480. Its totient is φ = 120051936.

The previous prime is 280121207. The next prime is 280121243. The reversal of 280121212 is 212121082.

280121212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

280121212 is an admirable number.

280121212 is a modest number, since divided by 121212 gives 280 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 280121212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5002137 + ... + 5002192.

Almost surely, 2^280121212 is an apocalyptic number.

It is an amenable number.

280121212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

280121212 is a wasteful number, since it uses less digits than its factorization.

280121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10004340 (or 10004338 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 280121212 is about 16736.8220400409. The cubic root of 280121212 is about 654.3076513924.

Adding to 280121212 its reverse (212121082), we get a palindrome (492242294).

The spelling of 280121212 in words is "two hundred eighty million, one hundred twenty-one thousand, two hundred twelve".