1240143421421 has 8 divisors (see below), whose sum is σ = 1266711315840. Its totient is φ = 1213583104768.

The previous prime is 1240143421411. The next prime is 1240143421441. The reversal of 1240143421421 is 1241243410421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240143421421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240143421411) 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, 1563011 + ... + 2218848.

It is an arithmetic number, because the mean of its divisors is an integer number (158338914480).

Almost surely, 2^{1240143421421} is an apocalyptic number.

It is an amenable number.

1240143421421 is a deficient number, since it is larger than the sum of its proper divisors (26567894419).

1240143421421 is an equidigital number, since it uses as much as digits as its factorization.

1240143421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788883.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 1240143421421 its reverse (1241243410421), we get a palindrome (2481386831842).

The spelling of 1240143421421 in words is "one trillion, two hundred forty billion, one hundred forty-three million, four hundred twenty-one thousand, four hundred twenty-one".