121340421999 has 12 divisors (see below), whose sum is σ = 175272610656. Its totient is φ = 80892178272.

The previous prime is 121340421973. The next prime is 121340422001. The reversal of 121340421999 is 999124043121.

121340421999 is a `hidden beast` number, since 1 + 2 + 1 + 340 + 4 + 219 + 99 = 666.

It is not a de Polignac number, because 121340421999 - 2⁷ = 121340421871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121340421959) 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, 741162 + ... + 889944.

It is an arithmetic number, because the mean of its divisors is an integer number (14606050888).

Almost surely, 2^121340421999 is an apocalyptic number.

121340421999 is a deficient number, since it is larger than the sum of its proper divisors (53932188657).

121340421999 is a wasteful number, since it uses less digits than its factorization.

121340421999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239406 (or 239403 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 121340421999 in words is "one hundred twenty-one billion, three hundred forty million, four hundred twenty-one thousand, nine hundred ninety-nine".