135043621 has 4 divisors (see below), whose sum is σ = 142151200. Its totient is φ = 127936044.

The previous prime is 135043619. The next prime is 135043637. The reversal of 135043621 is 126340531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 135043621 - 2¹ = 135043619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135043661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553761 + ... + 3553798.

It is an arithmetic number, because the mean of its divisors is an integer number (35537800).

Almost surely, 2^135043621 is an apocalyptic number.

It is an amenable number.

135043621 is a deficient number, since it is larger than the sum of its proper divisors (7107579).

135043621 is an equidigital number, since it uses as much as digits as its factorization.

135043621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107578.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 135043621 is about 11620.8270359730. The cubic root of 135043621 is about 513.0480305425.

The spelling of 135043621 in words is "one hundred thirty-five million, forty-three thousand, six hundred twenty-one".