1240020321 has 16 divisors (see below), whose sum is σ = 1734794880. Its totient is φ = 786360960.

The previous prime is 1240020319. The next prime is 1240020361. The reversal of 1240020321 is 1230200421.

It is not a de Polignac number, because 1240020321 - 2¹ = 1240020319 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 1240020321.

It is not an unprimeable number, because it can be changed into a prime (1240020311) 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, 37156 + ... + 62133.

It is an arithmetic number, because the mean of its divisors is an integer number (108424680).

Almost surely, 2^1240020321 is an apocalyptic number.

It is an amenable number.

1240020321 is a deficient number, since it is larger than the sum of its proper divisors (494774559).

1240020321 is a wasteful number, since it uses less digits than its factorization.

1240020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99496.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1240020321 is about 35213.9222609467. The cubic root of 1240020321 is about 1074.3429396676.

Adding to 1240020321 its reverse (1230200421), we get a palindrome (2470220742).

The spelling of 1240020321 in words is "one billion, two hundred forty million, twenty thousand, three hundred twenty-one".