172221221605722 has 8 divisors (see below), whose sum is σ = 344442443211456. Its totient is φ = 57407073868572.

The previous prime is 172221221605721. The next prime is 172221221605729. The reversal of 172221221605722 is 227506122122271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

172221221605722 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (172221221605721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14351768467138 + ... + 14351768467149.

It is an arithmetic number, because the mean of its divisors is an integer number (43055305401432).

Almost surely, 2^{172221221605722} is an apocalyptic number.

172221221605722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

172221221605722 is a wasteful number, since it uses less digits than its factorization.

172221221605722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28703536934292.

The product of its (nonzero) digits is 188160, while the sum is 42.

Adding to 172221221605722 its reverse (227506122122271), we get a palindrome (399727343727993).

The spelling of 172221221605722 in words is "one hundred seventy-two trillion, two hundred twenty-one billion, two hundred twenty-one million, six hundred five thousand, seven hundred twenty-two".