1221024413040 has 40 divisors (see below), whose sum is σ = 3785175681168. Its totient is φ = 325606510080.

The previous prime is 1221024412967. The next prime is 1221024413047. The reversal of 1221024413040 is 403144201221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1221024413040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221024413047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543800621 + ... + 2543801100.

Almost surely, 2^{1221024413040} is an apocalyptic number.

1221024413040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221024413040 is an abundant number, since it is smaller than the sum of its proper divisors (2564151268128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221024413040 is a wasteful number, since it uses less digits than its factorization.

1221024413040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087601737 (or 5087601731 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1221024413040 its reverse (403144201221), we get a palindrome (1624168614261).

The spelling of 1221024413040 in words is "one trillion, two hundred twenty-one billion, twenty-four million, four hundred thirteen thousand, forty".