42015195217 has 2 divisors, whose sum is σ = 42015195218. Its totient is φ = 42015195216.

The previous prime is 42015195199. The next prime is 42015195221. The reversal of 42015195217 is 71259151024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22861742401 + 19153452816 = 151201^2 + 138396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42015195217 is a prime.

It is not a weakly prime, because it can be changed into another prime (42015195617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21007597608 + 21007597609.

It is an arithmetic number, because the mean of its divisors is an integer number (21007597609).

Almost surely, 2^42015195217 is an apocalyptic number.

It is an amenable number.

42015195217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42015195217 is an equidigital number, since it uses as much as digits as its factorization.

42015195217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 42015195217 in words is "forty-two billion, fifteen million, one hundred ninety-five thousand, two hundred seventeen".