211001021100221 has 4 divisors (see below), whose sum is σ = 230182932109344. Its totient is φ = 191819110091100.

The previous prime is 211001021100167. The next prime is 211001021100227. The reversal of 211001021100221 is 122001120100112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211001021100221 is a prime.

It is a super-2 number, since 2×211001021100221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211001021100196 and 211001021100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001021100227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9590955504545 + ... + 9590955504566.

It is an arithmetic number, because the mean of its divisors is an integer number (57545733027336).

Almost surely, 2^{211001021100221} is an apocalyptic number.

It is an amenable number.

211001021100221 is a deficient number, since it is larger than the sum of its proper divisors (19181911009123).

211001021100221 is a wasteful number, since it uses less digits than its factorization.

211001021100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19181911009122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211001021100221 its reverse (122001120100112), we get a palindrome (333002141200333).

The spelling of 211001021100221 in words is "two hundred eleven trillion, one billion, twenty-one million, one hundred thousand, two hundred twenty-one".