121396891 has 8 divisors (see below), whose sum is σ = 151352064. Its totient is φ = 94594920.

The previous prime is 121396867. The next prime is 121396931. The reversal of 121396891 is 198693121.

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

It is not a de Polignac number, because 121396891 - 2¹⁷ = 121265819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121396811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 788215 + ... + 788368.

It is an arithmetic number, because the mean of its divisors is an integer number (18919008).

Almost surely, 2^121396891 is an apocalyptic number.

121396891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121396891 is a deficient number, since it is larger than the sum of its proper divisors (29955173).

121396891 is a wasteful number, since it uses less digits than its factorization.

121396891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576601.

The product of its digits is 23328, while the sum is 40.

The square root of 121396891 is about 11018.0257305926. The cubic root of 121396891 is about 495.1489413382.

The spelling of 121396891 in words is "one hundred twenty-one million, three hundred ninety-six thousand, eight hundred ninety-one".