121216151 has 12 divisors (see below), whose sum is σ = 141504552. Its totient is φ = 103532688.

The previous prime is 121216129. The next prime is 121216157. The reversal of 121216151 is 151612121.

It is not a de Polignac number, because 121216151 - 2¹⁸ = 120954007 is a prime.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 10136 + ... + 18578.

It is an arithmetic number, because the mean of its divisors is an integer number (11792046).

Almost surely, 2^121216151 is an apocalyptic number.

121216151 is a deficient number, since it is larger than the sum of its proper divisors (20288401).

121216151 is an equidigital number, since it uses as much as digits as its factorization.

121216151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8750 (or 8743 counting only the distinct ones).

The product of its digits is 120, while the sum is 20.

The square root of 121216151 is about 11009.8206615730. The cubic root of 121216151 is about 494.9030875132.

Adding to 121216151 its reverse (151612121), we get a palindrome (272828272).

The spelling of 121216151 in words is "one hundred twenty-one million, two hundred sixteen thousand, one hundred fifty-one".