135555540514021 has 4 divisors (see below), whose sum is σ = 137271433432000. Its totient is φ = 133839647596044.

The previous prime is 135555540514007. The next prime is 135555540514091. The reversal of 135555540514021 is 120415045555531.

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 135555540514021 - 2³⁷ = 135418101560549 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 (135555540514091) 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, 857946458871 + ... + 857946459028.

It is an arithmetic number, because the mean of its divisors is an integer number (34317858358000).

Almost surely, 2^{135555540514021} is an apocalyptic number.

It is an amenable number.

135555540514021 is a deficient number, since it is larger than the sum of its proper divisors (1715892917979).

135555540514021 is an equidigital number, since it uses as much as digits as its factorization.

135555540514021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715892917978.

The product of its (nonzero) digits is 1500000, while the sum is 46.

The spelling of 135555540514021 in words is "one hundred thirty-five trillion, five hundred fifty-five billion, five hundred forty million, five hundred fourteen thousand, twenty-one".