121212280 has 48 divisors (see below), whose sum is σ = 317259720. Its totient is φ = 41557824.

The previous prime is 121212253. The next prime is 121212281. The reversal of 121212280 is 82212121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28962 + ... + 32881.

Almost surely, 2^121212280 is an apocalyptic number.

121212280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212280 is an abundant number, since it is smaller than the sum of its proper divisors (196047440).

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

121212280 is a wasteful number, since it uses less digits than its factorization.

121212280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61868 (or 61857 counting only the distinct ones).

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

The square root of 121212280 is about 11009.6448625739. The cubic root of 121212280 is about 494.8978192651.

The spelling of 121212280 in words is "one hundred twenty-one million, two hundred twelve thousand, two hundred eighty".