172221240 has 96 divisors (see below), whose sum is σ = 540303120. Its totient is φ = 43912704.

The previous prime is 172221233. The next prime is 172221241. The reversal of 172221240 is 42122271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172221241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62124 + ... + 64836.

Almost surely, 2^172221240 is an apocalyptic number.

172221240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172221240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270151560).

172221240 is an abundant number, since it is smaller than the sum of its proper divisors (368081880).

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

172221240 is a wasteful number, since it uses less digits than its factorization.

172221240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 172221240 is about 13123.3090339289. The cubic root of 172221240 is about 556.3681205197.

The spelling of 172221240 in words is "one hundred seventy-two million, two hundred twenty-one thousand, two hundred forty".