211001022121221 has 48 divisors (see below), whose sum is σ = 313154583730560. Its totient is φ = 136829662058880.

The previous prime is 211001022121207. The next prime is 211001022121229. The reversal of 211001022121221 is 122121220100112.

211001022121221 is a `hidden beast` number, since 211 + 0 + 0 + 1 + 0 + 221 + 212 + 21 = 666.

211001022121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211001022121221 - 2²⁷ = 211000887903493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211001022121194 and 211001022121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001022121229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125647935 + ... + 127316163.

It is an arithmetic number, because the mean of its divisors is an integer number (6524053827720).

Almost surely, 2^{211001022121221} is an apocalyptic number.

It is an amenable number.

211001022121221 is a deficient number, since it is larger than the sum of its proper divisors (102153561609339).

211001022121221 is a wasteful number, since it uses less digits than its factorization.

211001022121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669626 (or 1669623 counting only the distinct ones).

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

Adding to 211001022121221 its reverse (122121220100112), we get a palindrome (333122242221333).

The spelling of 211001022121221 in words is "two hundred eleven trillion, one billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".