121421151 has 12 divisors (see below), whose sum is σ = 175950528. Its totient is φ = 80686944.

The previous prime is 121421137. The next prime is 121421159. The reversal of 121421151 is 151124121.

It is not a de Polignac number, because 121421151 - 2⁷ = 121421023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121421159) 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 11 ways as a sum of consecutive naturals, for example, 18735 + ... + 24368.

It is an arithmetic number, because the mean of its divisors is an integer number (14662544).

Almost surely, 2^121421151 is an apocalyptic number.

121421151 is a deficient number, since it is larger than the sum of its proper divisors (54529377).

121421151 is a wasteful number, since it uses less digits than its factorization.

121421151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43422 (or 43419 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 121421151 is about 11019.1265987827. The cubic root of 121421151 is about 495.1819227243.

Adding to 121421151 its reverse (151124121), we get a palindrome (272545272).

The spelling of 121421151 in words is "one hundred twenty-one million, four hundred twenty-one thousand, one hundred fifty-one".