121503153 has 8 divisors (see below), whose sum is σ = 166382848. Its totient is φ = 78812784.

The previous prime is 121503139. The next prime is 121503163. The reversal of 121503153 is 351305121.

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

It is not a de Polignac number, because 121503153 - 2⁸ = 121502897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121503103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547201 + ... + 547422.

It is an arithmetic number, because the mean of its divisors is an integer number (20797856).

Almost surely, 2^121503153 is an apocalyptic number.

It is an amenable number.

121503153 is a deficient number, since it is larger than the sum of its proper divisors (44879695).

121503153 is a wasteful number, since it uses less digits than its factorization.

121503153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094663.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 121503153 is about 11022.8468645809. The cubic root of 121503153 is about 495.2933716497.

Adding to 121503153 its reverse (351305121), we get a palindrome (472808274).

The spelling of 121503153 in words is "one hundred twenty-one million, five hundred three thousand, one hundred fifty-three".