1142240431421 has 4 divisors (see below), whose sum is σ = 1209431045052. Its totient is φ = 1075049817792.

The previous prime is 1142240431361. The next prime is 1142240431429. The reversal of 1142240431421 is 1241340422411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1070624784100 + 71615647321 = 1034710^2 + 267611^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1142240431421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142240431429) 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 3 ways as a sum of consecutive naturals, for example, 33595306790 + ... + 33595306823.

It is an arithmetic number, because the mean of its divisors is an integer number (302357761263).

Almost surely, 2^{1142240431421} is an apocalyptic number.

It is an amenable number.

1142240431421 is a deficient number, since it is larger than the sum of its proper divisors (67190613631).

1142240431421 is an equidigital number, since it uses as much as digits as its factorization.

1142240431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67190613630.

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

Adding to 1142240431421 its reverse (1241340422411), we get a palindrome (2383580853832).

The spelling of 1142240431421 in words is "one trillion, one hundred forty-two billion, two hundred forty million, four hundred thirty-one thousand, four hundred twenty-one".