135421533251 has 4 divisors (see below), whose sum is σ = 135424276512. Its totient is φ = 135418789992.

The previous prime is 135421533211. The next prime is 135421533253. The reversal of 135421533251 is 152335124531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135421533251 - 2⁶ = 135421533187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135421533253) 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, 1296200 + ... + 1396773.

It is an arithmetic number, because the mean of its divisors is an integer number (33856069128).

Almost surely, 2^135421533251 is an apocalyptic number.

135421533251 is a deficient number, since it is larger than the sum of its proper divisors (2743261).

135421533251 is an equidigital number, since it uses as much as digits as its factorization.

135421533251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743260.

The product of its digits is 54000, while the sum is 35.

Adding to 135421533251 its reverse (152335124531), we get a palindrome (287756657782).

The spelling of 135421533251 in words is "one hundred thirty-five billion, four hundred twenty-one million, five hundred thirty-three thousand, two hundred fifty-one".