1021440045 has 16 divisors (see below), whose sum is σ = 1647175680. Its totient is φ = 540477504.

The previous prime is 1021440041. The next prime is 1021440047. The reversal of 1021440045 is 5400441201.

It is a happy number.

It is not a de Polignac number, because 1021440045 - 2² = 1021440041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021440041) 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, 266190 + ... + 269999.

It is an arithmetic number, because the mean of its divisors is an integer number (102948480).

Almost surely, 2^1021440045 is an apocalyptic number.

1021440045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021440045 is a deficient number, since it is larger than the sum of its proper divisors (625735635).

1021440045 is a wasteful number, since it uses less digits than its factorization.

1021440045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536324.

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

The square root of 1021440045 is about 31959.9756727066. The cubic root of 1021440045 is about 1007.0962064087.

Adding to 1021440045 its reverse (5400441201), we get a palindrome (6421881246).

The spelling of 1021440045 in words is "one billion, twenty-one million, four hundred forty thousand, forty-five".