210020001 has 16 divisors (see below), whose sum is σ = 292353600. Its totient is φ = 133939008.

The previous prime is 210019991. The next prime is 210020003. The reversal of 210020001 is 100020012.

It is a happy number.

It is not a de Polignac number, because 210020001 - 2⁶ = 210019937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210020003) 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 in 15 ways as a sum of consecutive naturals, for example, 1591 + ... + 20556.

It is an arithmetic number, because the mean of its divisors is an integer number (18272100).

Almost surely, 2^210020001 is an apocalyptic number.

It is an amenable number.

210020001 is a deficient number, since it is larger than the sum of its proper divisors (82333599).

210020001 is a wasteful number, since it uses less digits than its factorization.

210020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22288.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 210020001 is about 14492.0668298211. The cubic root of 210020001 is about 594.4110652142.

Adding to 210020001 its reverse (100020012), we get a palindrome (310040013).

The spelling of 210020001 in words is "two hundred ten million, twenty thousand, one".