642020211 has 12 divisors (see below), whose sum is σ = 1059842992. Its totient is φ = 366868656.

The previous prime is 642020209. The next prime is 642020221. The reversal of 642020211 is 112020246.

642020211 is a `hidden beast` number, since 642 + 0 + 2 + 0 + 21 + 1 = 666.

642020211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642020211 - 2¹ = 642020209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642020221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5095336 + ... + 5095461.

Almost surely, 2^642020211 is an apocalyptic number.

642020211 is a deficient number, since it is larger than the sum of its proper divisors (417822781).

642020211 is a wasteful number, since it uses less digits than its factorization.

642020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10190810 (or 10190807 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 642020211 is about 25338.1177477728. The cubic root of 642020211 is about 862.6796762408.

Adding to 642020211 its reverse (112020246), we get a palindrome (754040457).

The spelling of 642020211 in words is "six hundred forty-two million, twenty thousand, two hundred eleven".