145342221 has 12 divisors (see below), whose sum is σ = 202583808. Its totient is φ = 92680984.

The previous prime is 145342207. The next prime is 145342243. The reversal of 145342221 is 122243541.

It is not a de Polignac number, because 145342221 - 2⁶ = 145342157 is a prime.

It is a super-2 number, since 2×145342221² = 42248722410425682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145342191 and 145342200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145342121) 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, 44205 + ... + 47378.

It is an arithmetic number, because the mean of its divisors is an integer number (16881984).

Almost surely, 2^145342221 is an apocalyptic number.

It is an amenable number.

145342221 is a deficient number, since it is larger than the sum of its proper divisors (57241587).

145342221 is an equidigital number, since it uses as much as digits as its factorization.

145342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91632 (or 91609 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 145342221 is about 12055.7961578653. The cubic root of 145342221 is about 525.7717701278.

Adding to 145342221 its reverse (122243541), we get a palindrome (267585762).

The spelling of 145342221 in words is "one hundred forty-five million, three hundred forty-two thousand, two hundred twenty-one".