145032221 has 8 divisors (see below), whose sum is σ = 148552704. Its totient is φ = 141540880.

The previous prime is 145032191. The next prime is 145032233. The reversal of 145032221 is 122230541.

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

It is a cyclic number.

It is not a de Polignac number, because 145032221 - 2¹⁰ = 145031197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145032193 and 145032202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145032821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2960 + ... + 17286.

It is an arithmetic number, because the mean of its divisors is an integer number (18569088).

Almost surely, 2^145032221 is an apocalyptic number.

It is an amenable number.

145032221 is a deficient number, since it is larger than the sum of its proper divisors (3520483).

145032221 is a wasteful number, since it uses less digits than its factorization.

145032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14571.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 145032221 is about 12042.9324086785. The cubic root of 145032221 is about 525.3976983569.

Adding to 145032221 its reverse (122230541), we get a palindrome (267262762).

The spelling of 145032221 in words is "one hundred forty-five million, thirty-two thousand, two hundred twenty-one".