10121985 has 24 divisors (see below), whose sum is σ = 17956224. Its totient is φ = 5271840.

The previous prime is 10121963. The next prime is 10121999. The reversal of 10121985 is 58912101.

It is not a de Polignac number, because 10121985 - 2⁶ = 10121921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 681 + ... + 4550.

It is an arithmetic number, because the mean of its divisors is an integer number (748176).

Almost surely, 2^10121985 is an apocalyptic number.

10121985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10121985 is a deficient number, since it is larger than the sum of its proper divisors (7834239).

10121985 is a wasteful number, since it uses less digits than its factorization.

10121985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285 (or 5282 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 10121985 is about 3181.5067185219. The cubic root of 10121985 is about 216.3159599207.

The spelling of 10121985 in words is "ten million, one hundred twenty-one thousand, nine hundred eighty-five".