145306221 has 8 divisors (see below), whose sum is σ = 193995360. Its totient is φ = 96743952.

The previous prime is 145306177. The next prime is 145306229. The reversal of 145306221 is 122603541.

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

It is not a de Polignac number, because 145306221 - 2²⁵ = 111751789 is a prime.

It is a super-2 number, since 2×145306221² = 42227795722601682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145306191 and 145306200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145306229) 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 7 ways as a sum of consecutive naturals, for example, 29011 + ... + 33648.

It is an arithmetic number, because the mean of its divisors is an integer number (24249420).

Almost surely, 2^145306221 is an apocalyptic number.

It is an amenable number.

145306221 is a deficient number, since it is larger than the sum of its proper divisors (48689139).

145306221 is an equidigital number, since it uses as much as digits as its factorization.

145306221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63435.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 145306221 is about 12054.3030076401. The cubic root of 145306221 is about 525.7283568499.

Adding to 145306221 its reverse (122603541), we get a palindrome (267909762).

The spelling of 145306221 in words is "one hundred forty-five million, three hundred six thousand, two hundred twenty-one".