42004152012121 has 4 divisors (see below), whose sum is σ = 45235240628452. Its totient is φ = 38773063395792.

The previous prime is 42004152012107. The next prime is 42004152012133. The reversal of 42004152012121 is 12121025140024.

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 11817533776896 + 30186618235225 = 3437664^2 + 5494235^2 .

It is a cyclic number.

It is not a de Polignac number, because 42004152012121 - 2¹⁵ = 42004151979353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42004152012181) 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, 1615544308146 + ... + 1615544308171.

It is an arithmetic number, because the mean of its divisors is an integer number (11308810157113).

Almost surely, 2^{42004152012121} is an apocalyptic number.

It is an amenable number.

42004152012121 is a deficient number, since it is larger than the sum of its proper divisors (3231088616331).

42004152012121 is a wasteful number, since it uses less digits than its factorization.

42004152012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231088616330.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 42004152012121 its reverse (12121025140024), we get a palindrome (54125177152145).

The spelling of 42004152012121 in words is "forty-two trillion, four billion, one hundred fifty-two million, twelve thousand, one hundred twenty-one".