145221422 has 16 divisors (see below), whose sum is σ = 225154944. Its totient is φ = 70176000.

The previous prime is 145221421. The next prime is 145221437. The reversal of 145221422 is 224122541.

It is a super-2 number, since 2×145221422² = 42178522815404168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145221421) 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, 83522 + ... + 85242.

It is an arithmetic number, because the mean of its divisors is an integer number (14072184).

Almost surely, 2^145221422 is an apocalyptic number.

145221422 is a deficient number, since it is larger than the sum of its proper divisors (79933522).

145221422 is a wasteful number, since it uses less digits than its factorization.

145221422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115.

The product of its digits is 1280, while the sum is 23.

The square root of 145221422 is about 12050.7851196509. The cubic root of 145221422 is about 525.6260673223.

Adding to 145221422 its reverse (224122541), we get a palindrome (369343963).

The spelling of 145221422 in words is "one hundred forty-five million, two hundred twenty-one thousand, four hundred twenty-two".