42121099 has 2 divisors, whose sum is σ = 42121100. Its totient is φ = 42121098.

The previous prime is 42121097. The next prime is 42121147. The reversal of 42121099 is 99012124.

It is a happy number.

42121099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42121099 - 2¹ = 42121097 is a prime.

Together with 42121097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42121097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060549 + 21060550.

It is an arithmetic number, because the mean of its divisors is an integer number (21060550).

Almost surely, 2^42121099 is an apocalyptic number.

42121099 is a deficient number, since it is larger than the sum of its proper divisors (1).

42121099 is an equidigital number, since it uses as much as digits as its factorization.

42121099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 42121099 is about 6490.0769641045. The cubic root of 42121099 is about 347.9364259390.

The spelling of 42121099 in words is "forty-two million, one hundred twenty-one thousand, ninety-nine".