210200021 has 8 divisors (see below), whose sum is σ = 221518080. Its totient is φ = 198907488.

The previous prime is 210199999. The next prime is 210200077. The reversal of 210200021 is 120002012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210200021 - 2¹⁸ = 209937877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210199981 and 210200008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210200321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11900 + ... + 23706.

It is an arithmetic number, because the mean of its divisors is an integer number (27689760).

Almost surely, 2^210200021 is an apocalyptic number.

It is an amenable number.

210200021 is a deficient number, since it is larger than the sum of its proper divisors (11318059).

210200021 is a wasteful number, since it uses less digits than its factorization.

210200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12763.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 210200021 is about 14498.2764837756. The cubic root of 210200021 is about 594.5808511400.

Adding to 210200021 its reverse (120002012), we get a palindrome (330202033).

The spelling of 210200021 in words is "two hundred ten million, two hundred thousand, twenty-one".