121398151 has 4 divisors (see below), whose sum is σ = 138740752. Its totient is φ = 104055552.

The previous prime is 121398149. The next prime is 121398187. The reversal of 121398151 is 151893121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121398151 - 2¹ = 121398149 is a prime.

It is a super-2 number, since 2×121398151² = 29475022132437602, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121398451) 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, 8671290 + ... + 8671303.

It is an arithmetic number, because the mean of its divisors is an integer number (34685188).

Almost surely, 2^121398151 is an apocalyptic number.

121398151 is a deficient number, since it is larger than the sum of its proper divisors (17342601).

121398151 is an equidigital number, since it uses as much as digits as its factorization.

121398151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17342600.

The product of its digits is 2160, while the sum is 31.

The square root of 121398151 is about 11018.0829094720. The cubic root of 121398151 is about 495.1506544120.

It can be divided in two parts, 12139 and 8151, that multiplied together give a palindrome (98944989).

The spelling of 121398151 in words is "one hundred twenty-one million, three hundred ninety-eight thousand, one hundred fifty-one".