121025817 has 12 divisors (see below), whose sum is σ = 190707504. Its totient is φ = 73348920.

The previous prime is 121025797. The next prime is 121025843. The reversal of 121025817 is 718520121.

It is not a de Polignac number, because 121025817 - 2⁷ = 121025689 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (121025887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 611143 + ... + 611340.

It is an arithmetic number, because the mean of its divisors is an integer number (15892292).

Almost surely, 2^121025817 is an apocalyptic number.

It is an amenable number.

121025817 is a deficient number, since it is larger than the sum of its proper divisors (69681687).

121025817 is a wasteful number, since it uses less digits than its factorization.

121025817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222500 (or 1222497 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 121025817 is about 11001.1734374111. The cubic root of 121025817 is about 494.6439189967.

Adding to 121025817 its reverse (718520121), we get a palindrome (839545938).

The spelling of 121025817 in words is "one hundred twenty-one million, twenty-five thousand, eight hundred seventeen".