42156013321 has 2 divisors, whose sum is σ = 42156013322. Its totient is φ = 42156013320.

The previous prime is 42156013303. The next prime is 42156013373. The reversal of 42156013321 is 12331065124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38834220096 + 3321793225 = 197064^2 + 57635^2 .

It is a cyclic number.

It is not a de Polignac number, because 42156013321 - 2⁹ = 42156012809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42156013321.

It is not a weakly prime, because it can be changed into another prime (42156013391) 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, 21078006660 + 21078006661.

It is an arithmetic number, because the mean of its divisors is an integer number (21078006661).

Almost surely, 2^42156013321 is an apocalyptic number.

It is an amenable number.

42156013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42156013321 is an equidigital number, since it uses as much as digits as its factorization.

42156013321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 42156013321 its reverse (12331065124), we get a palindrome (54487078445).

The spelling of 42156013321 in words is "forty-two billion, one hundred fifty-six million, thirteen thousand, three hundred twenty-one".