135035256721 has 8 divisors (see below), whose sum is σ = 138861107840. Its totient is φ = 131218681968.

The previous prime is 135035256679. The next prime is 135035256739. The reversal of 135035256721 is 127652530531.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-135035256721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135035256781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2289561 + ... + 2347798.

It is an arithmetic number, because the mean of its divisors is an integer number (17357638480).

Almost surely, 2^135035256721 is an apocalyptic number.

It is an amenable number.

135035256721 is a deficient number, since it is larger than the sum of its proper divisors (3825851119).

135035256721 is an equidigital number, since it uses as much as digits as its factorization.

135035256721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4638183.

The product of its (nonzero) digits is 189000, while the sum is 40.

The spelling of 135035256721 in words is "one hundred thirty-five billion, thirty-five million, two hundred fifty-six thousand, seven hundred twenty-one".