121216015 has 8 divisors (see below), whose sum is σ = 145625040. Its totient is φ = 96862272.

The previous prime is 121216013. The next prime is 121216057. The reversal of 121216015 is 510612121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121216015 - 2¹ = 121216013 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121215983 and 121216001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121216013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8830 + ... + 17899.

It is an arithmetic number, because the mean of its divisors is an integer number (18203130).

Almost surely, 2^121216015 is an apocalyptic number.

121216015 is a deficient number, since it is larger than the sum of its proper divisors (24409025).

121216015 is an equidigital number, since it uses as much as digits as its factorization.

121216015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27641.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 121216015 is about 11009.8144852672. The cubic root of 121216015 is about 494.9029024255.

Adding to 121216015 its reverse (510612121), we get a palindrome (631828136).

The spelling of 121216015 in words is "one hundred twenty-one million, two hundred sixteen thousand, fifteen".