145342021 has 8 divisors (see below), whose sum is σ = 162242784. Its totient is φ = 129055920.

The previous prime is 145342019. The next prime is 145342033. The reversal of 145342021 is 120243541.

145342021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 145342021 - 2¹ = 145342019 is a prime.

It is a super-2 number, since 2×145342021² = 42248606136728882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145341983 and 145342001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145342081) 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, 153166 + ... + 154111.

It is an arithmetic number, because the mean of its divisors is an integer number (20280348).

Almost surely, 2^145342021 is an apocalyptic number.

145342021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145342021 is a deficient number, since it is larger than the sum of its proper divisors (16900763).

145342021 is a wasteful number, since it uses less digits than its factorization.

145342021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307331.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 145342021 is about 12055.7878630971. The cubic root of 145342021 is about 525.7715289627.

Adding to 145342021 its reverse (120243541), we get a palindrome (265585562).

The spelling of 145342021 in words is "one hundred forty-five million, three hundred forty-two thousand, twenty-one".