135221403 has 32 divisors (see below), whose sum is σ = 193052160. Its totient is φ = 84035840.

The previous prime is 135221381. The next prime is 135221441. The reversal of 135221403 is 304122531.

It is a cyclic number.

It is not a de Polignac number, because 135221403 - 2⁵ = 135221371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135221403.

It is not an unprimeable number, because it can be changed into a prime (135221453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 595576 + ... + 595802.

It is an arithmetic number, because the mean of its divisors is an integer number (6032880).

Almost surely, 2^135221403 is an apocalyptic number.

135221403 is a deficient number, since it is larger than the sum of its proper divisors (57830757).

135221403 is a wasteful number, since it uses less digits than its factorization.

135221403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 135221403 is about 11628.4738035565. The cubic root of 135221403 is about 513.2730706885.

Adding to 135221403 its reverse (304122531), we get a palindrome (439343934).

The spelling of 135221403 in words is "one hundred thirty-five million, two hundred twenty-one thousand, four hundred three".