209120878427 has 2 divisors, whose sum is σ = 209120878428. Its totient is φ = 209120878426.

The previous prime is 209120878411. The next prime is 209120878453. The reversal of 209120878427 is 724878021902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209120878427 - 2⁴ = 209120878411 is a prime.

It is a super-2 number, since 2×209120878427² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209120878457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104560439213 + 104560439214.

It is an arithmetic number, because the mean of its divisors is an integer number (104560439214).

Almost surely, 2^209120878427 is an apocalyptic number.

209120878427 is a deficient number, since it is larger than the sum of its proper divisors (1).

209120878427 is an equidigital number, since it uses as much as digits as its factorization.

209120878427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 209120878427 in words is "two hundred nine billion, one hundred twenty million, eight hundred seventy-eight thousand, four hundred twenty-seven".