121866615 has 24 divisors (see below), whose sum is σ = 227485440. Its totient is φ = 59995584.

The previous prime is 121866583. The next prime is 121866617. The reversal of 121866615 is 516668121.

It is not a de Polignac number, because 121866615 - 2⁵ = 121866583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121866615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121866617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103575 + ... + 104744.

It is an arithmetic number, because the mean of its divisors is an integer number (9478560).

Almost surely, 2^121866615 is an apocalyptic number.

121866615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121866615 is a deficient number, since it is larger than the sum of its proper divisors (105618825).

121866615 is a wasteful number, since it uses less digits than its factorization.

121866615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208343 (or 208340 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 121866615 is about 11039.3213106604. The cubic root of 121866615 is about 495.7867501059.

The spelling of 121866615 in words is "one hundred twenty-one million, eight hundred sixty-six thousand, six hundred fifteen".