146440021 has 12 divisors (see below), whose sum is σ = 181225632. Its totient is φ = 115863696.

The previous prime is 146440013. The next prime is 146440037. The reversal of 146440021 is 120044641.

It is not a de Polignac number, because 146440021 - 2³ = 146440013 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 146439974 and 146440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146441021) 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 11 ways as a sum of consecutive naturals, for example, 60711 + ... + 63076.

It is an arithmetic number, because the mean of its divisors is an integer number (15102136).

Almost surely, 2^146440021 is an apocalyptic number.

It is an amenable number.

146440021 is a deficient number, since it is larger than the sum of its proper divisors (34785611).

146440021 is a wasteful number, since it uses less digits than its factorization.

146440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123820 (or 123807 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 146440021 is about 12101.2404736043. The cubic root of 146440021 is about 527.0922056606.

Adding to 146440021 its reverse (120044641), we get a palindrome (266484662).

The spelling of 146440021 in words is "one hundred forty-six million, four hundred forty thousand, twenty-one".