42215550991 has 2 divisors, whose sum is σ = 42215550992. Its totient is φ = 42215550990.

The previous prime is 42215550907. The next prime is 42215551013. The reversal of 42215550991 is 19905551224.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42215550991 - 2¹⁵ = 42215518223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42215550191) 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, 21107775495 + 21107775496.

It is an arithmetic number, because the mean of its divisors is an integer number (21107775496).

Almost surely, 2^42215550991 is an apocalyptic number.

42215550991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215550991 is an equidigital number, since it uses as much as digits as its factorization.

42215550991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 42215550991 in words is "forty-two billion, two hundred fifteen million, five hundred fifty thousand, nine hundred ninety-one".