209030521670 has 16 divisors (see below), whose sum is σ = 377112019680. Its totient is φ = 83421746304.

The previous prime is 209030521649. The next prime is 209030521691. The reversal of 209030521670 is 76125030902.

It is an interprime number because it is at equal distance from previous prime (209030521649) and next prime (209030521691).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 209030521670.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23803187 + ... + 23811966.

It is an arithmetic number, because the mean of its divisors is an integer number (23569501230).

Almost surely, 2^209030521670 is an apocalyptic number.

209030521670 is a deficient number, since it is larger than the sum of its proper divisors (168081498010).

209030521670 is a wasteful number, since it uses less digits than its factorization.

209030521670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47615599.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 209030521670 in words is "two hundred nine billion, thirty million, five hundred twenty-one thousand, six hundred seventy".