121085685 has 96 divisors (see below), whose sum is σ = 259983360. Its totient is φ = 52861248.

The previous prime is 121085621. The next prime is 121085687. The reversal of 121085685 is 586580121.

It is not a de Polignac number, because 121085685 - 2⁶ = 121085621 is a prime.

It is a super-2 number, since 2×121085685² = 29323486223838450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121085687) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 195306 + ... + 195924.

It is an arithmetic number, because the mean of its divisors is an integer number (2708160).

Almost surely, 2^121085685 is an apocalyptic number.

121085685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121085685 is an abundant number, since it is smaller than the sum of its proper divisors (138897675).

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

121085685 is an equidigital number, since it uses as much as digits as its factorization.

121085685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 121085685 is about 11003.8940834597. The cubic root of 121085685 is about 494.7254676042.

The spelling of 121085685 in words is "one hundred twenty-one million, eighty-five thousand, six hundred eighty-five".