135054004021 has 4 divisors (see below), whose sum is σ = 135059112972. Its totient is φ = 135048895072.

The previous prime is 135054004003. The next prime is 135054004027. The reversal of 135054004021 is 120400450531.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 134443222225 + 610781796 = 366665^2 + 24714^2 .

It is a cyclic number.

It is not a de Polignac number, because 135054004021 - 2⁵ = 135054003989 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 (135054004027) 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, 2514616 + ... + 2567761.

It is an arithmetic number, because the mean of its divisors is an integer number (33764778243).

Almost surely, 2^135054004021 is an apocalyptic number.

It is an amenable number.

135054004021 is a deficient number, since it is larger than the sum of its proper divisors (5108951).

135054004021 is an equidigital number, since it uses as much as digits as its factorization.

135054004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108950.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 135054004021 its reverse (120400450531), we get a palindrome (255454454552).

The spelling of 135054004021 in words is "one hundred thirty-five billion, fifty-four million, four thousand, twenty-one".