1243240032221 has 16 divisors (see below), whose sum is σ = 1367236696320. Its totient is φ = 1121109319680.

The previous prime is 1243240032211. The next prime is 1243240032263. The reversal of 1243240032221 is 1222300423421.

It is a cyclic number.

It is not a de Polignac number, because 1243240032221 - 2¹⁴ = 1243240015837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243240032211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244376 + ... + 1595681.

It is an arithmetic number, because the mean of its divisors is an integer number (85452293520).

Almost surely, 2^{1243240032221} is an apocalyptic number.

1243240032221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243240032221 is a deficient number, since it is larger than the sum of its proper divisors (123996664099).

1243240032221 is a wasteful number, since it uses less digits than its factorization.

1243240032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840564.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 1243240032221 its reverse (1222300423421), we get a palindrome (2465540455642).

The spelling of 1243240032221 in words is "one trillion, two hundred forty-three billion, two hundred forty million, thirty-two thousand, two hundred twenty-one".