142641543221 has 12 divisors (see below), whose sum is σ = 157884355692. Its totient is φ = 128413862016.

The previous prime is 142641543211. The next prime is 142641543229. The reversal of 142641543221 is 122345146241.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 113225520100 + 29416023121 = 336490^2 + 171511^2 .

It is a de Polignac number, because none of the positive numbers 2^k-142641543221 is a prime.

It is a super-2 number, since 2×142641543221² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142641543229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7921706 + ... + 7939691.

It is an arithmetic number, because the mean of its divisors is an integer number (13157029641).

Almost surely, 2^142641543221 is an apocalyptic number.

It is an amenable number.

142641543221 is a deficient number, since it is larger than the sum of its proper divisors (15242812471).

142641543221 is a wasteful number, since it uses less digits than its factorization.

142641543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15861460 (or 15861437 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

Adding to 142641543221 its reverse (122345146241), we get a palindrome (264986689462).

The spelling of 142641543221 in words is "one hundred forty-two billion, six hundred forty-one million, five hundred forty-three thousand, two hundred twenty-one".