42221747 has 2 divisors, whose sum is σ = 42221748. Its totient is φ = 42221746.

The previous prime is 42221741. The next prime is 42221749. The reversal of 42221747 is 74712224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42221747 - 2⁴ = 42221731 is a prime.

Together with 42221749, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42221741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110873 + 21110874.

It is an arithmetic number, because the mean of its divisors is an integer number (21110874).

Almost surely, 2^42221747 is an apocalyptic number.

42221747 is a deficient number, since it is larger than the sum of its proper divisors (1).

42221747 is an equidigital number, since it uses as much as digits as its factorization.

42221747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 29.

The square root of 42221747 is about 6497.8263288580. The cubic root of 42221747 is about 348.2133358534.

The spelling of 42221747 in words is "forty-two million, two hundred twenty-one thousand, seven hundred forty-seven".