121818939820 has 24 divisors (see below), whose sum is σ = 264072025728. Its totient is φ = 47155718400.

The previous prime is 121818939721. The next prime is 121818939833. The reversal of 121818939820 is 28939818121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98240461 + ... + 98241700.

It is an arithmetic number, because the mean of its divisors is an integer number (11003001072).

Almost surely, 2^121818939820 is an apocalyptic number.

121818939820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121818939820 is an abundant number, since it is smaller than the sum of its proper divisors (142253085908).

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

121818939820 is a wasteful number, since it uses less digits than its factorization.

121818939820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196482201 (or 196482199 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 52.

The spelling of 121818939820 in words is "one hundred twenty-one billion, eight hundred eighteen million, nine hundred thirty-nine thousand, eight hundred twenty".