121777378 has 4 divisors (see below), whose sum is σ = 182666070. Its totient is φ = 60888688.

The previous prime is 121777367. The next prime is 121777399. The reversal of 121777378 is 873777121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873777121 = 7 ⋅124825303.

It can be written as a sum of positive squares in only one way, i.e., 69605649 + 52171729 = 8343^2 + 7223^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30444343 + ... + 30444346.

Almost surely, 2^121777378 is an apocalyptic number.

121777378 is a deficient number, since it is larger than the sum of its proper divisors (60888692).

121777378 is an equidigital number, since it uses as much as digits as its factorization.

121777378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60888691.

The product of its digits is 115248, while the sum is 43.

The square root of 121777378 is about 11035.2787912223. The cubic root of 121777378 is about 495.6657070417.

The spelling of 121777378 in words is "one hundred twenty-one million, seven hundred seventy-seven thousand, three hundred seventy-eight".