1221343143142 has 12 divisors (see below), whose sum is σ = 1897366015116. Its totient is φ = 589613930360.

The previous prime is 1221343143133. The next prime is 1221343143149. The reversal of 1221343143142 is 2413413431221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221343143149) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363061084 + ... + 363064447.

It is an arithmetic number, because the mean of its divisors is an integer number (158113834593).

Almost surely, 2^{1221343143142} is an apocalyptic number.

1221343143142 is a deficient number, since it is larger than the sum of its proper divisors (676022871974).

1221343143142 is an equidigital number, since it uses as much as digits as its factorization.

1221343143142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726125591 (or 726125562 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

Adding to 1221343143142 its reverse (2413413431221), we get a palindrome (3634756574363).

The spelling of 1221343143142 in words is "one trillion, two hundred twenty-one billion, three hundred forty-three million, one hundred forty-three thousand, one hundred forty-two".