145221105 has 16 divisors (see below), whose sum is σ = 237758400. Its totient is φ = 75649728.

The previous prime is 145221077. The next prime is 145221107. The reversal of 145221105 is 501122541.

It is not a de Polignac number, because 145221105 - 2⁵ = 145221073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145221107) 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, 111930 + ... + 113219.

It is an arithmetic number, because the mean of its divisors is an integer number (14859900).

Almost surely, 2^145221105 is an apocalyptic number.

145221105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145221105 is a deficient number, since it is larger than the sum of its proper divisors (92537295).

145221105 is a wasteful number, since it uses less digits than its factorization.

145221105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225200.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 145221105 is about 12050.7719669737. The cubic root of 145221105 is about 525.6256848636.

Adding to 145221105 its reverse (501122541), we get a palindrome (646343646).

The spelling of 145221105 in words is "one hundred forty-five million, two hundred twenty-one thousand, one hundred five".