145032321 has 16 divisors (see below), whose sum is σ = 234002304. Its totient is φ = 78000384.

The previous prime is 145032317. The next prime is 145032323. The reversal of 145032321 is 123230541.

It is not a de Polignac number, because 145032321 - 2² = 145032317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (145032323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202770 + ... + 203483.

It is an arithmetic number, because the mean of its divisors is an integer number (14625144).

Almost surely, 2^145032321 is an apocalyptic number.

It is an amenable number.

145032321 is a deficient number, since it is larger than the sum of its proper divisors (88969983).

145032321 is a wasteful number, since it uses less digits than its factorization.

145032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406280.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 145032321 is about 12042.9365604906. The cubic root of 145032321 is about 525.3978191111.

Adding to 145032321 its reverse (123230541), we get a palindrome (268262862).

The spelling of 145032321 in words is "one hundred forty-five million, thirty-two thousand, three hundred twenty-one".