173221390 has 8 divisors (see below), whose sum is σ = 311798520. Its totient is φ = 69288552.

The previous prime is 173221387. The next prime is 173221393. The reversal of 173221390 is 93122371.

It is an interprime number because it is at equal distance from previous prime (173221387) and next prime (173221393).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173221393) 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, 8661060 + ... + 8661079.

It is an arithmetic number, because the mean of its divisors is an integer number (38974815).

Almost surely, 2^173221390 is an apocalyptic number.

173221390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

173221390 is a deficient number, since it is larger than the sum of its proper divisors (138577130).

173221390 is a wasteful number, since it uses less digits than its factorization.

173221390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17322146.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 173221390 is about 13161.3597321857. The cubic root of 173221390 is about 557.4430515539.

The spelling of 173221390 in words is "one hundred seventy-three million, two hundred twenty-one thousand, three hundred ninety".