135361005621 has 4 divisors (see below), whose sum is σ = 180481340832. Its totient is φ = 90240670412.

The previous prime is 135361005583. The next prime is 135361005641. The reversal of 135361005621 is 126500163531.

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 135361005621 - 2¹⁸ = 135360743477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135361005641) 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, 22560167601 + ... + 22560167606.

It is an arithmetic number, because the mean of its divisors is an integer number (45120335208).

Almost surely, 2^135361005621 is an apocalyptic number.

It is an amenable number.

135361005621 is a deficient number, since it is larger than the sum of its proper divisors (45120335211).

135361005621 is an equidigital number, since it uses as much as digits as its factorization.

135361005621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45120335210.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 135361005621 in words is "one hundred thirty-five billion, three hundred sixty-one million, five thousand, six hundred twenty-one".