135531021442 has 16 divisors (see below), whose sum is σ = 222677744760. Its totient is φ = 61580017408.

The previous prime is 135531021389. The next prime is 135531021443. The reversal of 135531021442 is 244120135531.

It can be written as a sum of positive squares in 4 ways, for example, as 135292288041 + 238733401 = 367821^2 + 15451^2 .

It is a super-2 number, since 2×135531021442² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135531021443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68726713 + ... + 68728684.

Almost surely, 2^135531021442 is an apocalyptic number.

135531021442 is a deficient number, since it is larger than the sum of its proper divisors (87146723318).

135531021442 is a wasteful number, since it uses less digits than its factorization.

135531021442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137455445.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 135531021442 its reverse (244120135531), we get a palindrome (379651156973).

The spelling of 135531021442 in words is "one hundred thirty-five billion, five hundred thirty-one million, twenty-one thousand, four hundred forty-two".