121216153 has 4 divisors (see below), whose sum is σ = 121736628. Its totient is φ = 120695680.

The previous prime is 121216129. The next prime is 121216157. The reversal of 121216153 is 351612121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 351612121 = 7 ⋅50230303.

It can be written as a sum of positive squares in 2 ways, for example, as 84879369 + 36336784 = 9213^2 + 6028^2 .

It is a cyclic number.

It is not a de Polignac number, because 121216153 - 2⁹ = 121215641 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121216157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259888 + ... + 260353.

It is an arithmetic number, because the mean of its divisors is an integer number (30434157).

Almost surely, 2^121216153 is an apocalyptic number.

It is an amenable number.

121216153 is a deficient number, since it is larger than the sum of its proper divisors (520475).

121216153 is an equidigital number, since it uses as much as digits as its factorization.

121216153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520474.

The product of its digits is 360, while the sum is 22.

The square root of 121216153 is about 11009.8207524010. The cubic root of 121216153 is about 494.9030902350.

Adding to 121216153 its reverse (351612121), we get a palindrome (472828274).

The spelling of 121216153 in words is "one hundred twenty-one million, two hundred sixteen thousand, one hundred fifty-three".