240534135666021 has 4 divisors (see below), whose sum is σ = 320712180888032. Its totient is φ = 160356090444012.

The previous prime is 240534135666007. The next prime is 240534135666023. The reversal of 240534135666021 is 120666531435042.

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 not a de Polignac number, because 240534135666021 - 2⁷ = 240534135665893 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 (240534135666023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40089022611001 + ... + 40089022611006.

It is an arithmetic number, because the mean of its divisors is an integer number (80178045222008).

Almost surely, 2^{240534135666021} is an apocalyptic number.

It is an amenable number.

240534135666021 is a deficient number, since it is larger than the sum of its proper divisors (80178045222011).

240534135666021 is an equidigital number, since it uses as much as digits as its factorization.

240534135666021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80178045222010.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 240534135666021 in words is "two hundred forty trillion, five hundred thirty-four billion, one hundred thirty-five million, six hundred sixty-six thousand, twenty-one".