642042211 has 4 divisors (see below), whose sum is σ = 642148624. Its totient is φ = 641935800.

The previous prime is 642042197. The next prime is 642042221. The reversal of 642042211 is 112240246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112240246 = 2 ⋅56120123.

It is a cyclic number.

It is not a de Polignac number, because 642042211 - 2¹⁵ = 642009443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642042221) 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 in 3 ways as a sum of consecutive naturals, for example, 43575 + ... + 56416.

It is an arithmetic number, because the mean of its divisors is an integer number (160537156).

Almost surely, 2^642042211 is an apocalyptic number.

642042211 is a deficient number, since it is larger than the sum of its proper divisors (106413).

642042211 is an equidigital number, since it uses as much as digits as its factorization.

642042211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106412.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 642042211 is about 25338.5518725913. The cubic root of 642042211 is about 862.6895298953.

Adding to 642042211 its reverse (112240246), we get a palindrome (754282457).

The spelling of 642042211 in words is "six hundred forty-two million, forty-two thousand, two hundred eleven".