145300221 has 24 divisors (see below), whose sum is σ = 235151904. Its totient is φ = 85678560.

The previous prime is 145300123. The next prime is 145300247. The reversal of 145300221 is 122003541.

145300221 is a `hidden beast` number, since 145 + 300 + 221 = 666.

It is not a de Polignac number, because 145300221 - 2¹⁰ = 145299197 is a prime.

It is a super-2 number, since 2×145300221² = 42224308445297682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145300194 and 145300203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145300261) 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, 16171 + ... + 23496.

It is an arithmetic number, because the mean of its divisors is an integer number (9797996).

Almost surely, 2^145300221 is an apocalyptic number.

145300221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145300221 is a deficient number, since it is larger than the sum of its proper divisors (89851683).

145300221 is a wasteful number, since it uses less digits than its factorization.

145300221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39721 (or 39718 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 145300221 is about 12054.0541312871. The cubic root of 145300221 is about 525.7211206065.

Adding to 145300221 its reverse (122003541), we get a palindrome (267303762).

The spelling of 145300221 in words is "one hundred forty-five million, three hundred thousand, two hundred twenty-one".