135623234240521 has 12 divisors (see below), whose sum is σ = 138061390824396. Its totient is φ = 133227325446720.

The previous prime is 135623234240503. The next prime is 135623234240537. The reversal of 135623234240521 is 125042432326531.

It can be written as a sum of positive squares in 6 ways, for example, as 96790395680521 + 38832838560000 = 9838211^2 + 6231600^2 .

It is not a de Polignac number, because 135623234240521 - 2⁵ = 135623234240489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135623234240821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20699386 + ... + 26452051.

It is an arithmetic number, because the mean of its divisors is an integer number (11505115902033).

Almost surely, 2^{135623234240521} is an apocalyptic number.

It is an amenable number.

135623234240521 is a deficient number, since it is larger than the sum of its proper divisors (2438156583875).

135623234240521 is an frugal number, since it uses more digits than its factorization.

135623234240521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47152332 (or 47152271 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 135623234240521 in words is "one hundred thirty-five trillion, six hundred twenty-three billion, two hundred thirty-four million, two hundred forty thousand, five hundred twenty-one".