121340353499 has 4 divisors (see below), whose sum is σ = 123396969720. Its totient is φ = 119283737280.

The previous prime is 121340353483. The next prime is 121340353517. The reversal of 121340353499 is 994353043121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994353043121 = 337627 ⋅2945123.

It is a cyclic number.

It is not a de Polignac number, because 121340353499 - 2⁴ = 121340353483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121340353469) 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, 1028308022 + ... + 1028308139.

It is an arithmetic number, because the mean of its divisors is an integer number (30849242430).

Almost surely, 2^121340353499 is an apocalyptic number.

121340353499 is a deficient number, since it is larger than the sum of its proper divisors (2056616221).

121340353499 is an equidigital number, since it uses as much as digits as its factorization.

121340353499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056616220.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 121340353499 in words is "one hundred twenty-one billion, three hundred forty million, three hundred fifty-three thousand, four hundred ninety-nine".