121218020 has 48 divisors (see below), whose sum is σ = 317374848. Its totient is φ = 37781760.

The previous prime is 121217983. The next prime is 121218059. The reversal of 121218020 is 20812121.

121218020 = 358² + 359² + ... + 742².

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121218020.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37817 + ... + 40896.

It is an arithmetic number, because the mean of its divisors is an integer number (6611976).

Almost surely, 2^121218020 is an apocalyptic number.

121218020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121218020 is an abundant number, since it is smaller than the sum of its proper divisors (196156828).

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

121218020 is a wasteful number, since it uses less digits than its factorization.

121218020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78740 (or 78738 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 121218020 is about 11009.9055400126. The cubic root of 121218020 is about 494.9056310937.

The spelling of 121218020 in words is "one hundred twenty-one million, two hundred eighteen thousand, twenty".