121017816 has 24 divisors (see below), whose sum is σ = 327756780. Its totient is φ = 40339248.

The previous prime is 121017811. The next prime is 121017817. The reversal of 121017816 is 618710121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121017816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121017811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 840330 + ... + 840473.

Almost surely, 2^121017816 is an apocalyptic number.

It is an amenable number.

121017816 is an abundant number, since it is smaller than the sum of its proper divisors (206738964).

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

121017816 is a wasteful number, since it uses less digits than its factorization.

121017816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680815 (or 1680808 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 121017816 is about 11000.8097883747. The cubic root of 121017816 is about 494.6330184762.

Adding to 121017816 its reverse (618710121), we get a palindrome (739727937).

The spelling of 121017816 in words is "one hundred twenty-one million, seventeen thousand, eight hundred sixteen".