121240220 has 24 divisors (see below), whose sum is σ = 260527344. Its totient is φ = 47367936.

The previous prime is 121240219. The next prime is 121240253. The reversal of 121240220 is 22042121.

It is a junction number, because it is equal to n+sod(n) for n = 121240195 and 121240204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69629 + ... + 71348.

It is an arithmetic number, because the mean of its divisors is an integer number (10855306).

Almost surely, 2^121240220 is an apocalyptic number.

121240220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121240220 is an abundant number, since it is smaller than the sum of its proper divisors (139287124).

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

121240220 is a wasteful number, since it uses less digits than its factorization.

121240220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141029 (or 141027 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 121240220 is about 11010.9136768935. The cubic root of 121240220 is about 494.9358417680.

Adding to 121240220 its reverse (22042121), we get a palindrome (143282341).

The spelling of 121240220 in words is "one hundred twenty-one million, two hundred forty thousand, two hundred twenty".