642120201 has 12 divisors (see below), whose sum is σ = 927828720. Its totient is φ = 427931640.

The previous prime is 642120151. The next prime is 642120223. The reversal of 642120201 is 102021246.

642120201 is a `hidden beast` number, since 642 + 1 + 2 + 0 + 20 + 1 = 666.

It is not a de Polignac number, because 642120201 - 2¹⁴ = 642103817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642120301) 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, 19270 + ... + 40688.

It is an arithmetic number, because the mean of its divisors is an integer number (77319060).

Almost surely, 2^642120201 is an apocalyptic number.

It is an amenable number.

642120201 is a deficient number, since it is larger than the sum of its proper divisors (285708519).

642120201 is a wasteful number, since it uses less digits than its factorization.

642120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24756 (or 24753 counting only the distinct ones).

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

The square root of 642120201 is about 25340.0907851570. The cubic root of 642120201 is about 862.7244592874.

Adding to 642120201 its reverse (102021246), we get a palindrome (744141447).

The spelling of 642120201 in words is "six hundred forty-two million, one hundred twenty thousand, two hundred one".