135332721 has 8 divisors (see below), whose sum is σ = 200492960. Its totient is φ = 90221796.

The previous prime is 135332719. The next prime is 135332731. The reversal of 135332721 is 127233531.

It is not a de Polignac number, because 135332721 - 2¹ = 135332719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5012323 = 135332721 / (1 + 3 + 5 + 3 + 3 + 2 + 7 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135332731) 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, 2506135 + ... + 2506188.

It is an arithmetic number, because the mean of its divisors is an integer number (25061620).

Almost surely, 2^135332721 is an apocalyptic number.

It is an amenable number.

135332721 is a deficient number, since it is larger than the sum of its proper divisors (65160239).

135332721 is an equidigital number, since it uses as much as digits as its factorization.

135332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012332 (or 5012326 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 135332721 is about 11633.2592595540. The cubic root of 135332721 is about 513.4138789206.

The spelling of 135332721 in words is "one hundred thirty-five million, three hundred thirty-two thousand, seven hundred twenty-one".