135221373 has 16 divisors (see below), whose sum is σ = 228946560. Its totient is φ = 77269248.

The previous prime is 135221371. The next prime is 135221381. The reversal of 135221373 is 373122531.

135221373 is a `hidden beast` number, since 1 + 3 + 522 + 137 + 3 = 666.

It is not a de Polignac number, because 135221373 - 2¹ = 135221371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135221371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357540 + ... + 357917.

It is an arithmetic number, because the mean of its divisors is an integer number (14309160).

Almost surely, 2^135221373 is an apocalyptic number.

It is an amenable number.

135221373 is a deficient number, since it is larger than the sum of its proper divisors (93725187).

135221373 is an equidigital number, since it uses as much as digits as its factorization.

135221373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715473 (or 715467 counting only the distinct ones).

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

The square root of 135221373 is about 11628.4725136193. The cubic root of 135221373 is about 513.2730327306.

The spelling of 135221373 in words is "one hundred thirty-five million, two hundred twenty-one thousand, three hundred seventy-three".