209102212925 has 24 divisors (see below), whose sum is σ = 269604625152. Its totient is φ = 160703856000.

The previous prime is 209102212889. The next prime is 209102212933. The reversal of 209102212925 is 529212201902.

It is a de Polignac number, because none of the positive numbers 2^k-209102212925 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 878531 + ... + 1090880.

It is an arithmetic number, because the mean of its divisors is an integer number (11233526048).

Almost surely, 2^209102212925 is an apocalyptic number.

209102212925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209102212925 is a deficient number, since it is larger than the sum of its proper divisors (60502412227).

209102212925 is a wasteful number, since it uses less digits than its factorization.

209102212925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969589 (or 1969584 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 209102212925 in words is "two hundred nine billion, one hundred two million, two hundred twelve thousand, nine hundred twenty-five".