121520151 has 12 divisors (see below), whose sum is σ = 175940128. Its totient is φ = 80823744.

The previous prime is 121520141. The next prime is 121520159. The reversal of 121520151 is 151025121.

It is not a de Polignac number, because 121520151 - 2⁹ = 121519639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121520159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11695 + ... + 19488.

Almost surely, 2^121520151 is an apocalyptic number.

121520151 is a deficient number, since it is larger than the sum of its proper divisors (54419977).

121520151 is a wasteful number, since it uses less digits than its factorization.

121520151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31622 (or 31619 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 121520151 is about 11023.6178725498. The cubic root of 121520151 is about 495.3164673580.

Adding to 121520151 its reverse (151025121), we get a palindrome (272545272).

The spelling of 121520151 in words is "one hundred twenty-one million, five hundred twenty thousand, one hundred fifty-one".