42521224135121 has 4 divisors (see below), whose sum is σ = 42521783678832. Its totient is φ = 42520664591412.

The previous prime is 42521224135111. The next prime is 42521224135193. The reversal of 42521224135121 is 12153142212524.

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 a de Polignac number, because none of the positive numbers 2^k-42521224135121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42521224135111) 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, 279657851 + ... + 279809856.

It is an arithmetic number, because the mean of its divisors is an integer number (10630445919708).

Almost surely, 2^{42521224135121} is an apocalyptic number.

It is an amenable number.

42521224135121 is a deficient number, since it is larger than the sum of its proper divisors (559543711).

42521224135121 is an equidigital number, since it uses as much as digits as its factorization.

42521224135121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559543710.

The product of its digits is 38400, while the sum is 35.

Adding to 42521224135121 its reverse (12153142212524), we get a palindrome (54674366347645).

The spelling of 42521224135121 in words is "forty-two trillion, five hundred twenty-one billion, two hundred twenty-four million, one hundred thirty-five thousand, one hundred twenty-one".