42521233121 has 2 divisors, whose sum is σ = 42521233122. Its totient is φ = 42521233120.

The previous prime is 42521233099. The next prime is 42521233123. The reversal of 42521233121 is 12133212524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33503641600 + 9017591521 = 183040^2 + 94961^2 .

It is a cyclic number.

It is not a de Polignac number, because 42521233121 - 2²⁶ = 42454124257 is a prime.

It is a super-2 number, since 2×42521233121² (a number of 22 digits) contains 22 as substring.

Together with 42521233123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42521233123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260616560 + 21260616561.

It is an arithmetic number, because the mean of its divisors is an integer number (21260616561).

Almost surely, 2^42521233121 is an apocalyptic number.

It is an amenable number.

42521233121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521233121 is an equidigital number, since it uses as much as digits as its factorization.

42521233121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

Adding to 42521233121 its reverse (12133212524), we get a palindrome (54654445645).

The spelling of 42521233121 in words is "forty-two billion, five hundred twenty-one million, two hundred thirty-three thousand, one hundred twenty-one".