145230021 has 12 divisors (see below), whose sum is σ = 211855020. Its totient is φ = 95860800.

The previous prime is 145230011. The next prime is 145230037. The reversal of 145230021 is 120032541.

It can be written as a sum of positive squares in 2 ways, for example, as 127916100 + 17313921 = 11310^2 + 4161^2 .

It is not a de Polignac number, because 145230021 - 2⁵ = 145229989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145229976 and 145230003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145230011) 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, 78976 + ... + 80793.

It is an arithmetic number, because the mean of its divisors is an integer number (17654585).

Almost surely, 2^145230021 is an apocalyptic number.

It is an amenable number.

145230021 is a deficient number, since it is larger than the sum of its proper divisors (66624999).

145230021 is a wasteful number, since it uses less digits than its factorization.

145230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159876 (or 159873 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 145230021 is about 12051.1418961026. The cubic root of 145230021 is about 525.6364417544.

Adding to 145230021 its reverse (120032541), we get a palindrome (265262562).

The spelling of 145230021 in words is "one hundred forty-five million, two hundred thirty thousand, twenty-one".