1240343143221 has 32 divisors (see below), whose sum is σ = 2078742048768. Its totient is φ = 640326778560.

The previous prime is 1240343143219. The next prime is 1240343143229. The reversal of 1240343143221 is 1223413430421.

It is not a de Polignac number, because 1240343143221 - 2¹ = 1240343143219 is a prime.

It is a super-2 number, since 2×1240343143221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240343143229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48321015 + ... + 48346676.

It is an arithmetic number, because the mean of its divisors is an integer number (64960689024).

Almost surely, 2^{1240343143221} is an apocalyptic number.

It is an amenable number.

1240343143221 is a deficient number, since it is larger than the sum of its proper divisors (838398905547).

1240343143221 is a wasteful number, since it uses less digits than its factorization.

1240343143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96667761.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 1240343143221 its reverse (1223413430421), we get a palindrome (2463756573642).

The spelling of 1240343143221 in words is "one trillion, two hundred forty billion, three hundred forty-three million, one hundred forty-three thousand, two hundred twenty-one".