121441778357 has 8 divisors (see below), whose sum is σ = 128793827736. Its totient is φ = 114112886272.

The previous prime is 121441778333. The next prime is 121441778369. The reversal of 121441778357 is 753877144121.

It can be written as a sum of positive squares in 4 ways, for example, as 12621623716 + 108820154641 = 112346^2 + 329879^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121441778357 - 2¹⁰ = 121441777333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121441778327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5778518 + ... + 5799495.

It is an arithmetic number, because the mean of its divisors is an integer number (16099228467).

Almost surely, 2^121441778357 is an apocalyptic number.

121441778357 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121441778357 is a deficient number, since it is larger than the sum of its proper divisors (7352049379).

121441778357 is a wasteful number, since it uses less digits than its factorization.

121441778357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578647.

The product of its digits is 1317120, while the sum is 50.

The spelling of 121441778357 in words is "one hundred twenty-one billion, four hundred forty-one million, seven hundred seventy-eight thousand, three hundred fifty-seven".