211021200221 has 24 divisors (see below), whose sum is σ = 247580895744. Its totient is φ = 178583836320.

The previous prime is 211021200191. The next prime is 211021200233. The reversal of 211021200221 is 122002120112.

It is not a de Polignac number, because 211021200221 - 2³⁴ = 193841331037 is a prime.

It is a super-2 number, since 2×211021200221² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211021200196 and 211021200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021200241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 579761 + ... + 870726.

It is an arithmetic number, because the mean of its divisors is an integer number (10315870656).

Almost surely, 2^211021200221 is an apocalyptic number.

It is an amenable number.

211021200221 is a deficient number, since it is larger than the sum of its proper divisors (36559695523).

211021200221 is a wasteful number, since it uses less digits than its factorization.

211021200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450569 (or 1450550 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211021200221 its reverse (122002120112), we get a palindrome (333023320333).

The spelling of 211021200221 in words is "two hundred eleven billion, twenty-one million, two hundred thousand, two hundred twenty-one".