135252021 has 8 divisors (see below), whose sum is σ = 181443040. Its totient is φ = 89614512.

The previous prime is 135252011. The next prime is 135252031. The reversal of 135252021 is 120252531.

It is an interprime number because it is at equal distance from previous prime (135252011) and next prime (135252031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135252021 - 2⁶ = 135251957 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 (135252011) 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, 137806 + ... + 138783.

It is an arithmetic number, because the mean of its divisors is an integer number (22680380).

Almost surely, 2^135252021 is an apocalyptic number.

It is an amenable number.

135252021 is a deficient number, since it is larger than the sum of its proper divisors (46191019).

135252021 is a wasteful number, since it uses less digits than its factorization.

135252021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276755.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 135252021 is about 11629.7902388650. The cubic root of 135252021 is about 513.3118076748.

The spelling of 135252021 in words is "one hundred thirty-five million, two hundred fifty-two thousand, twenty-one".