121399081 has 4 divisors (see below), whose sum is σ = 121737600. Its totient is φ = 121060564.

The previous prime is 121399067. The next prime is 121399093. The reversal of 121399081 is 180993121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180993121 = 797 ⋅227093.

It is a cyclic number.

It is not a de Polignac number, because 121399081 - 2¹¹ = 121397033 is a prime.

It is a super-2 number, since 2×121399081² = 29475473735289122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121399001) 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, 168721 + ... + 169438.

It is an arithmetic number, because the mean of its divisors is an integer number (30434400).

Almost surely, 2^121399081 is an apocalyptic number.

It is an amenable number.

121399081 is a deficient number, since it is larger than the sum of its proper divisors (338519).

121399081 is an equidigital number, since it uses as much as digits as its factorization.

121399081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338518.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 121399081 is about 11018.1251127404. The cubic root of 121399081 is about 495.1519188160.

The spelling of 121399081 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, eighty-one".