209232021652 has 18 divisors (see below), whose sum is σ = 368508430878. Its totient is φ = 103943971872.

The previous prime is 209232021641. The next prime is 209232021697. The reversal of 209232021652 is 256120232902.

It can be written as a sum of positive squares in 3 ways, for example, as 39095571076 + 170136450576 = 197726^2 + 412476^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11453758 + ... + 11472010.

Almost surely, 2^209232021652 is an apocalyptic number.

It is an amenable number.

209232021652 is a deficient number, since it is larger than the sum of its proper divisors (159276409226).

209232021652 is an frugal number, since it uses more digits than its factorization.

209232021652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36667 (or 18412 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 209232021652 in words is "two hundred nine billion, two hundred thirty-two million, twenty-one thousand, six hundred fifty-two".