211021101222021 has 6 divisors (see below), whose sum is σ = 304808257320710. Its totient is φ = 140680734148008.

The previous prime is 211021101222007. The next prime is 211021101222079. The reversal of 211021101222021 is 120222101120112.

211021101222021 is a `hidden beast` number, since 211 + 0 + 211 + 0 + 1 + 2 + 220 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 177983321599521 + 33037779622500 = 13341039^2 + 5747850^2 .

It is not a de Polignac number, because 211021101222021 - 2¹⁰ = 211021101220997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211021101221985 and 211021101222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021101222121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11723394512326 + ... + 11723394512343.

Almost surely, 2^{211021101222021} is an apocalyptic number.

It is an amenable number.

211021101222021 is a deficient number, since it is larger than the sum of its proper divisors (93787156098689).

211021101222021 is a wasteful number, since it uses less digits than its factorization.

211021101222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23446789024675 (or 23446789024672 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211021101222021 its reverse (120222101120112), we get a palindrome (331243202342133).

The spelling of 211021101222021 in words is "two hundred eleven trillion, twenty-one billion, one hundred one million, two hundred twenty-two thousand, twenty-one".