211320200021 has 16 divisors (see below), whose sum is σ = 249904406400. Its totient is φ = 174838281408.

The previous prime is 211320199999. The next prime is 211320200033. The reversal of 211320200021 is 120002023112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-211320200021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211320199969 and 211320200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211320203021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619811 + ... + 898223.

It is an arithmetic number, because the mean of its divisors is an integer number (15619025400).

Almost surely, 2^211320200021 is an apocalyptic number.

It is an amenable number.

211320200021 is a deficient number, since it is larger than the sum of its proper divisors (38584206379).

211320200021 is a wasteful number, since it uses less digits than its factorization.

211320200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282188.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 211320200021 its reverse (120002023112), we get a palindrome (331322223133).

The spelling of 211320200021 in words is "two hundred eleven billion, three hundred twenty million, two hundred thousand, twenty-one".