145221330 has 16 divisors (see below), whose sum is σ = 348531264. Its totient is φ = 38725680.

The previous prime is 145221289. The next prime is 145221331. The reversal of 145221330 is 33122541.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 145221297 and 145221306.

It is not an unprimeable number, because it can be changed into a prime (145221331) 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, 2420326 + ... + 2420385.

It is an arithmetic number, because the mean of its divisors is an integer number (21783204).

Almost surely, 2^145221330 is an apocalyptic number.

145221330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145221330 is an abundant number, since it is smaller than the sum of its proper divisors (203309934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145221330 is a wasteful number, since it uses less digits than its factorization.

145221330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840721.

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

The square root of 145221330 is about 12050.7813024716. The cubic root of 145221330 is about 525.6259563249.

Adding to 145221330 its reverse (33122541), we get a palindrome (178343871).

The spelling of 145221330 in words is "one hundred forty-five million, two hundred twenty-one thousand, three hundred thirty".