209305725222 has 48 divisors (see below), whose sum is σ = 460688394096. Its totient is φ = 63348542400.

The previous prime is 209305725221. The next prime is 209305725247. The reversal of 209305725222 is 222527503902.

It is a super-2 number, since 2×209305725222² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209305725221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 420468 + ... + 771624.

It is an arithmetic number, because the mean of its divisors is an integer number (9597674877).

Almost surely, 2^209305725222 is an apocalyptic number.

209305725222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 209305725222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230344197048).

209305725222 is an abundant number, since it is smaller than the sum of its proper divisors (251382668874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209305725222 is a wasteful number, since it uses less digits than its factorization.

209305725222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352005 (or 351994 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 209305725222 in words is "two hundred nine billion, three hundred five million, seven hundred twenty-five thousand, two hundred twenty-two".