121491890745 has 8 divisors (see below), whose sum is σ = 194387025216. Its totient is φ = 64795675056.

The previous prime is 121491890713. The next prime is 121491890759. The reversal of 121491890745 is 547098194121.

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

It is not a de Polignac number, because 121491890745 - 2⁵ = 121491890713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4049729677 + ... + 4049729706.

It is an arithmetic number, because the mean of its divisors is an integer number (24298378152).

Almost surely, 2^121491890745 is an apocalyptic number.

121491890745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121491890745 is a deficient number, since it is larger than the sum of its proper divisors (72895134471).

121491890745 is an equidigital number, since it uses as much as digits as its factorization.

121491890745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8099459391.

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 121491890745 in words is "one hundred twenty-one billion, four hundred ninety-one million, eight hundred ninety thousand, seven hundred forty-five".