135420034213221 has 4 divisors (see below), whose sum is σ = 180560045617632. Its totient is φ = 90280022808812.

The previous prime is 135420034213213. The next prime is 135420034213223. The reversal of 135420034213221 is 122312430024531.

It is a happy number.

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 135420034213221 - 2³ = 135420034213213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135420034213223) 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, 22570005702201 + ... + 22570005702206.

It is an arithmetic number, because the mean of its divisors is an integer number (45140011404408).

Almost surely, 2^{135420034213221} is an apocalyptic number.

It is an amenable number.

135420034213221 is a deficient number, since it is larger than the sum of its proper divisors (45140011404411).

135420034213221 is an equidigital number, since it uses as much as digits as its factorization.

135420034213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45140011404410.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 135420034213221 its reverse (122312430024531), we get a palindrome (257732464237752).

The spelling of 135420034213221 in words is "one hundred thirty-five trillion, four hundred twenty billion, thirty-four million, two hundred thirteen thousand, two hundred twenty-one".