121378357 has 4 divisors (see below), whose sum is σ = 122080140. Its totient is φ = 120676576.

The previous prime is 121378343. The next prime is 121378373. The reversal of 121378357 is 753873121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753873121 = 17299 ⋅43579.

It can be written as a sum of positive squares in 2 ways, for example, as 88096996 + 33281361 = 9386^2 + 5769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121378357 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 (121378457) 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, 350632 + ... + 350977.

It is an arithmetic number, because the mean of its divisors is an integer number (30520035).

Almost surely, 2^121378357 is an apocalyptic number.

It is an amenable number.

121378357 is a deficient number, since it is larger than the sum of its proper divisors (701783).

121378357 is an equidigital number, since it uses as much as digits as its factorization.

121378357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701782.

The product of its digits is 35280, while the sum is 37.

The square root of 121378357 is about 11017.1846222163. The cubic root of 121378357 is about 495.1237414684.

The spelling of 121378357 in words is "one hundred twenty-one million, three hundred seventy-eight thousand, three hundred fifty-seven".