2171423378 has 4 divisors (see below), whose sum is σ = 3257135070. Its totient is φ = 1085711688.

The previous prime is 2171423377. The next prime is 2171423383. The reversal of 2171423378 is 8733241712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2138785009 + 32638369 = 46247^2 + 5713^2 .

It is not an unprimeable number, because it can be changed into a prime (2171423377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542855843 + ... + 542855846.

Almost surely, 2^2171423378 is an apocalyptic number.

2171423378 is a deficient number, since it is larger than the sum of its proper divisors (1085711692).

2171423378 is a wasteful number, since it uses less digits than its factorization.

2171423378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085711691.

The product of its digits is 56448, while the sum is 38.

The square root of 2171423378 is about 46598.5340756552. The cubic root of 2171423378 is about 1294.9355976380.

The spelling of 2171423378 in words is "two billion, one hundred seventy-one million, four hundred twenty-three thousand, three hundred seventy-eight".