135442621 has 16 divisors (see below), whose sum is σ = 152012160. Its totient is φ = 119923200.

The previous prime is 135442597. The next prime is 135442649. The reversal of 135442621 is 126244531.

135442621 = 1033² + 1034² + ... + 1146².

It is a cyclic number.

It is not a de Polignac number, because 135442621 - 2⁵ = 135442589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135442621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135442691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47385 + ... + 50161.

It is an arithmetic number, because the mean of its divisors is an integer number (9500760).

Almost surely, 2^135442621 is an apocalyptic number.

It is an amenable number.

135442621 is a deficient number, since it is larger than the sum of its proper divisors (16569539).

135442621 is a wasteful number, since it uses less digits than its factorization.

135442621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964.

The product of its digits is 5760, while the sum is 28.

The square root of 135442621 is about 11637.9818267602. The cubic root of 135442621 is about 513.5528177725.

The spelling of 135442621 in words is "one hundred thirty-five million, four hundred forty-two thousand, six hundred twenty-one".