135424340021 has 8 divisors (see below), whose sum is σ = 135822429720. Its totient is φ = 135026332672.

The previous prime is 135424339991. The next prime is 135424340047. The reversal of 135424340021 is 120043424531.

It can be written as a sum of positive squares in 4 ways, for example, as 5701911121 + 129722428900 = 75511^2 + 360170^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135424340021 - 2¹⁴ = 135424323637 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 (135424340921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5165081 + ... + 5191233.

It is an arithmetic number, because the mean of its divisors is an integer number (16977803715).

Almost surely, 2^135424340021 is an apocalyptic number.

It is an amenable number.

135424340021 is a deficient number, since it is larger than the sum of its proper divisors (398089699).

135424340021 is a wasteful number, since it uses less digits than its factorization.

135424340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41175.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 135424340021 its reverse (120043424531), we get a palindrome (255467764552).

The spelling of 135424340021 in words is "one hundred thirty-five billion, four hundred twenty-four million, three hundred forty thousand, twenty-one".