121305681216 has 56 divisors (see below), whose sum is σ = 356616243840. Its totient is φ = 40435226496.

The previous prime is 121305681209. The next prime is 121305681239. The reversal of 121305681216 is 612186503121.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 35098296 + ... + 35101751.

Almost surely, 2^121305681216 is an apocalyptic number.

121305681216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121305681216 is an abundant number, since it is smaller than the sum of its proper divisors (235310562624).

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

121305681216 is an equidigital number, since it uses as much as digits as its factorization.

121305681216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70200068 (or 70200052 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 121305681216 in words is "one hundred twenty-one billion, three hundred five million, six hundred eighty-one thousand, two hundred sixteen".