42121147 has 2 divisors, whose sum is σ = 42121148. Its totient is φ = 42121146.

The previous prime is 42121099. The next prime is 42121151. The reversal of 42121147 is 74112124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42121147 is a prime.

It is not a weakly prime, because it can be changed into another prime (42121187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060573 + 21060574.

It is an arithmetic number, because the mean of its divisors is an integer number (21060574).

Almost surely, 2^42121147 is an apocalyptic number.

42121147 is a deficient number, since it is larger than the sum of its proper divisors (1).

42121147 is an equidigital number, since it uses as much as digits as its factorization.

42121147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 22.

The square root of 42121147 is about 6490.0806620565. The cubic root of 42121147 is about 347.9365581051.

The spelling of 42121147 in words is "forty-two million, one hundred twenty-one thousand, one hundred forty-seven".