135201421 has 4 divisors (see below), whose sum is σ = 135227232. Its totient is φ = 135175612.

The previous prime is 135201379. The next prime is 135201431. The reversal of 135201421 is 124102531.

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 a cyclic number.

It is not a de Polignac number, because 135201421 - 2¹¹ = 135199373 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 (135201431) 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, 1945 + ... + 16558.

It is an arithmetic number, because the mean of its divisors is an integer number (33806808).

Almost surely, 2^135201421 is an apocalyptic number.

It is an amenable number.

135201421 is a deficient number, since it is larger than the sum of its proper divisors (25811).

135201421 is an equidigital number, since it uses as much as digits as its factorization.

135201421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25810.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 135201421 is about 11627.6145876960. The cubic root of 135201421 is about 513.2477869008.

Adding to 135201421 its reverse (124102531), we get a palindrome (259303952).

It can be divided in two parts, 13520 and 1421, that added together give a palindrome (14941).

The spelling of 135201421 in words is "one hundred thirty-five million, two hundred one thousand, four hundred twenty-one".