145221423 has 8 divisors (see below), whose sum is σ = 193710000. Its totient is φ = 96773568.

The previous prime is 145221421. The next prime is 145221437. The reversal of 145221423 is 324122541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145221423 - 2¹ = 145221421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145221393 and 145221402.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558 + ... + 17051.

It is an arithmetic number, because the mean of its divisors is an integer number (24213750).

Almost surely, 2^145221423 is an apocalyptic number.

145221423 is a deficient number, since it is larger than the sum of its proper divisors (48488577).

145221423 is a wasteful number, since it uses less digits than its factorization.

145221423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20361.

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

The square root of 145221423 is about 12050.7851611420. The cubic root of 145221423 is about 525.6260685288.

Adding to 145221423 its reverse (324122541), we get a palindrome (469343964).

The spelling of 145221423 in words is "one hundred forty-five million, two hundred twenty-one thousand, four hundred twenty-three".