145246221 has 12 divisors (see below), whose sum is σ = 210601248. Its totient is φ = 96461064.

The previous prime is 145246207. The next prime is 145246229. The reversal of 145246221 is 122642541.

145246221 is a `hidden beast` number, since 14 + 5 + 24 + 622 + 1 = 666.

It is not a de Polignac number, because 145246221 - 2⁷ = 145246093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145246229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28315 + ... + 33048.

It is an arithmetic number, because the mean of its divisors is an integer number (17550104).

Almost surely, 2^145246221 is an apocalyptic number.

It is an amenable number.

145246221 is a deficient number, since it is larger than the sum of its proper divisors (65355027).

145246221 is a wasteful number, since it uses less digits than its factorization.

145246221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61632 (or 61629 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 145246221 is about 12051.8140128364. The cubic root of 145246221 is about 525.6559854495.

Adding to 145246221 its reverse (122642541), we get a palindrome (267888762).

The spelling of 145246221 in words is "one hundred forty-five million, two hundred forty-six thousand, two hundred twenty-one".