135987320321 has 8 divisors (see below), whose sum is σ = 136068988704. Its totient is φ = 135905683680.

The previous prime is 135987320243. The next prime is 135987320323. The reversal of 135987320321 is 123023789531.

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 135987320321 - 2¹⁸ = 135987058177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135987320323) 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, 19874861 + ... + 19881701.

It is an arithmetic number, because the mean of its divisors is an integer number (17008623588).

Almost surely, 2^135987320321 is an apocalyptic number.

It is an amenable number.

135987320321 is a deficient number, since it is larger than the sum of its proper divisors (81668383).

135987320321 is an equidigital number, since it uses as much as digits as its factorization.

135987320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15871.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 135987320321 in words is "one hundred thirty-five billion, nine hundred eighty-seven million, three hundred twenty thousand, three hundred twenty-one".