135212421 has 8 divisors (see below), whose sum is σ = 186098944. Its totient is φ = 87233760.

The previous prime is 135212411. The next prime is 135212431. The reversal of 135212421 is 124212531.

It is an interprime number because it is at equal distance from previous prime (135212411) and next prime (135212431).

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

It is not a de Polignac number, because 135212421 - 2¹⁰ = 135211397 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 (135212411) 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, 726856 + ... + 727041.

It is an arithmetic number, because the mean of its divisors is an integer number (23262368).

Almost surely, 2^135212421 is an apocalyptic number.

It is an amenable number.

135212421 is a deficient number, since it is larger than the sum of its proper divisors (50886523).

135212421 is a wasteful number, since it uses less digits than its factorization.

135212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453931.

The product of its digits is 480, while the sum is 21.

The square root of 135212421 is about 11628.0875899694. The cubic root of 135212421 is about 513.2617058190.

Adding to 135212421 its reverse (124212531), we get a palindrome (259424952).

The spelling of 135212421 in words is "one hundred thirty-five million, two hundred twelve thousand, four hundred twenty-one".