1215451211142 has 48 divisors (see below), whose sum is σ = 2828257605360. Its totient is φ = 347213668032.

The previous prime is 1215451211123. The next prime is 1215451211203. The reversal of 1215451211142 is 2411121545121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1429668 + ... + 2115384.

It is an arithmetic number, because the mean of its divisors is an integer number (58922033445).

Almost surely, 2^{1215451211142} is an apocalyptic number.

1215451211142 is an abundant number, since it is smaller than the sum of its proper divisors (1612806394218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215451211142 is a wasteful number, since it uses less digits than its factorization.

1215451211142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691765 (or 691758 counting only the distinct ones).

The product of its digits is 3200, while the sum is 30.

Adding to 1215451211142 its reverse (2411121545121), we get a palindrome (3626572756263).

The spelling of 1215451211142 in words is "one trillion, two hundred fifteen billion, four hundred fifty-one million, two hundred eleven thousand, one hundred forty-two".