121222280 has 32 divisors (see below), whose sum is σ = 287107200. Its totient is φ = 45936576.

The previous prime is 121222273. The next prime is 121222331. The reversal of 121222280 is 82222121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 78992 + ... + 80511.

It is an arithmetic number, because the mean of its divisors is an integer number (8972100).

Almost surely, 2^121222280 is an apocalyptic number.

121222280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222280 is an abundant number, since it is smaller than the sum of its proper divisors (165884920).

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

121222280 is a wasteful number, since it uses less digits than its factorization.

121222280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159533 (or 159529 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 121222280 is about 11010.0990004632. The cubic root of 121222280 is about 494.9114285631.

The spelling of 121222280 in words is "one hundred twenty-one million, two hundred twenty-two thousand, two hundred eighty".