210020901 has 16 divisors (see below), whose sum is σ = 293536320. Its totient is φ = 133418880.

The previous prime is 210020897. The next prime is 210020933. The reversal of 210020901 is 109020012.

It is a happy number.

It is not a de Polignac number, because 210020901 - 2² = 210020897 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210020101) 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, 14566 + ... + 25143.

It is an arithmetic number, because the mean of its divisors is an integer number (18346020).

Almost surely, 2^210020901 is an apocalyptic number.

It is an amenable number.

210020901 is a deficient number, since it is larger than the sum of its proper divisors (83515419).

210020901 is a wasteful number, since it uses less digits than its factorization.

210020901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39796.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 210020901 is about 14492.0978812593. The cubic root of 210020901 is about 594.4119142908.

Adding to 210020901 its reverse (109020012), we get a palindrome (319040913).

The spelling of 210020901 in words is "two hundred ten million, twenty thousand, nine hundred one".