42220691 has 2 divisors, whose sum is σ = 42220692. Its totient is φ = 42220690.

The previous prime is 42220669. The next prime is 42220697. The reversal of 42220691 is 19602224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42220691 - 2¹⁸ = 41958547 is a prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 42220691.

It is not a weakly prime, because it can be changed into another prime (42220697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110345 + 21110346.

It is an arithmetic number, because the mean of its divisors is an integer number (21110346).

Almost surely, 2^42220691 is an apocalyptic number.

42220691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42220691 is an equidigital number, since it uses as much as digits as its factorization.

42220691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 42220691 is about 6497.7450704071. The cubic root of 42220691 is about 348.2104327969.

The spelling of 42220691 in words is "forty-two million, two hundred twenty thousand, six hundred ninety-one".