209070123771 has 32 divisors (see below), whose sum is σ = 288887234560. Its totient is φ = 134352691200.

The previous prime is 209070123601. The next prime is 209070123793. The reversal of 209070123771 is 177321070902.

It is not a de Polignac number, because 209070123771 - 2³⁴ = 191890254587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209070123071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77748795 + ... + 77751483.

It is an arithmetic number, because the mean of its divisors is an integer number (9027726080).

Almost surely, 2^209070123771 is an apocalyptic number.

209070123771 is a deficient number, since it is larger than the sum of its proper divisors (79817110789).

209070123771 is a wasteful number, since it uses less digits than its factorization.

209070123771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5707.

The product of its (nonzero) digits is 37044, while the sum is 39.

The spelling of 209070123771 in words is "two hundred nine billion, seventy million, one hundred twenty-three thousand, seven hundred seventy-one".