1445040021 has 16 divisors (see below), whose sum is σ = 2017935360. Its totient is φ = 918062640.

The previous prime is 1445040019. The next prime is 1445040053. The reversal of 1445040021 is 1200405441.

It is a happy number.

It is not a de Polignac number, because 1445040021 - 2¹ = 1445040019 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1445040021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445040061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19941 + ... + 57338.

It is an arithmetic number, because the mean of its divisors is an integer number (126120960).

Almost surely, 2^1445040021 is an apocalyptic number.

It is an amenable number.

1445040021 is a deficient number, since it is larger than the sum of its proper divisors (572895339).

1445040021 is a wasteful number, since it uses less digits than its factorization.

1445040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77576.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1445040021 is about 38013.6820237135. The cubic root of 1445040021 is about 1130.5591565305.

Adding to 1445040021 its reverse (1200405441), we get a palindrome (2645445462).

The spelling of 1445040021 in words is "one billion, four hundred forty-five million, forty thousand, twenty-one".