211211101020221 has 8 divisors (see below), whose sum is σ = 211258389889920. Its totient is φ = 211163817237408.

The previous prime is 211211101020203. The next prime is 211211101020253. The reversal of 211211101020221 is 122020101112112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211101020221 is a prime.

It is a super-2 number, since 2×211211101020221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211101020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211101020281) 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, 82393970 + ... + 84918716.

It is an arithmetic number, because the mean of its divisors is an integer number (26407298736240).

Almost surely, 2^{211211101020221} is an apocalyptic number.

It is an amenable number.

211211101020221 is a deficient number, since it is larger than the sum of its proper divisors (47288869699).

211211101020221 is a wasteful number, since it uses less digits than its factorization.

211211101020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543443.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211211101020221 its reverse (122020101112112), we get a palindrome (333231202132333).

The spelling of 211211101020221 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred one million, twenty thousand, two hundred twenty-one".