42111313421 has 2 divisors, whose sum is σ = 42111313422. Its totient is φ = 42111313420.

The previous prime is 42111313417. The next prime is 42111313429. The reversal of 42111313421 is 12431311124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35773561321 + 6337752100 = 189139^2 + 79610^2 .

It is a cyclic number.

It is not a de Polignac number, because 42111313421 - 2² = 42111313417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42111313429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21055656710 + 21055656711.

It is an arithmetic number, because the mean of its divisors is an integer number (21055656711).

Almost surely, 2^42111313421 is an apocalyptic number.

It is an amenable number.

42111313421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42111313421 is an equidigital number, since it uses as much as digits as its factorization.

42111313421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

Adding to 42111313421 its reverse (12431311124), we get a palindrome (54542624545).

The spelling of 42111313421 in words is "forty-two billion, one hundred eleven million, three hundred thirteen thousand, four hundred twenty-one".