135621033175221 has 16 divisors (see below), whose sum is σ = 197460166951488. Its totient is φ = 82114061558400.

The previous prime is 135621033175217. The next prime is 135621033175223. The reversal of 135621033175221 is 122571330126531.

It is not a de Polignac number, because 135621033175221 - 2² = 135621033175217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135621033175223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2012565856 + ... + 2012633241.

It is an arithmetic number, because the mean of its divisors is an integer number (12341260434468).

Almost surely, 2^{135621033175221} is an apocalyptic number.

135621033175221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135621033175221 is a deficient number, since it is larger than the sum of its proper divisors (61839133776267).

135621033175221 is a wasteful number, since it uses less digits than its factorization.

135621033175221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025200132.

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 135621033175221 in words is "one hundred thirty-five trillion, six hundred twenty-one billion, thirty-three million, one hundred seventy-five thousand, two hundred twenty-one".