121900791499 has 4 divisors (see below), whose sum is σ = 127200825936. Its totient is φ = 116600757064.

The previous prime is 121900791487. The next prime is 121900791503. The reversal of 121900791499 is 994197009121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994197009121 = 14797 ⋅67189093.

It is a cyclic number.

It is not a de Polignac number, because 121900791499 - 2³³ = 113310856907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121900791479) 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, 2650017184 + ... + 2650017229.

It is an arithmetic number, because the mean of its divisors is an integer number (31800206484).

Almost surely, 2^121900791499 is an apocalyptic number.

121900791499 is a deficient number, since it is larger than the sum of its proper divisors (5300034437).

121900791499 is an equidigital number, since it uses as much as digits as its factorization.

121900791499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300034436.

The product of its (nonzero) digits is 367416, while the sum is 52.

The spelling of 121900791499 in words is "one hundred twenty-one billion, nine hundred million, seven hundred ninety-one thousand, four hundred ninety-nine".