121212810585 has 32 divisors (see below), whose sum is σ = 215540897280. Its totient is φ = 64631395584.

The previous prime is 121212810547. The next prime is 121212810613. The reversal of 121212810585 is 585018212121.

121212810585 is a `hidden beast` number, since 1 + 21 + 21 + 28 + 10 + 585 = 666.

It is not a de Polignac number, because 121212810585 - 2¹¹ = 121212808537 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 471792 + ... + 681918.

It is an arithmetic number, because the mean of its divisors is an integer number (6735653040).

Almost surely, 2^121212810585 is an apocalyptic number.

121212810585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121212810585 is a deficient number, since it is larger than the sum of its proper divisors (94328086695).

121212810585 is a wasteful number, since it uses less digits than its factorization.

121212810585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214414 (or 214408 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The spelling of 121212810585 in words is "one hundred twenty-one billion, two hundred twelve million, eight hundred ten thousand, five hundred eighty-five".