211121220021221 has 8 divisors (see below), whose sum is σ = 218169936789024. Its totient is φ = 204169726933200.

The previous prime is 211121220021181. The next prime is 211121220021253. The reversal of 211121220021221 is 122120022121112.

211121220021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 211121220021221 - 2¹⁴ = 211121220004837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121220021193 and 211121220021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121220021521) 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, 24305915531 + ... + 24305924216.

It is an arithmetic number, because the mean of its divisors is an integer number (27271242098628).

Almost surely, 2^{211121220021221} is an apocalyptic number.

It is an amenable number.

211121220021221 is a deficient number, since it is larger than the sum of its proper divisors (7048716767803).

211121220021221 is a wasteful number, since it uses less digits than its factorization.

211121220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48611839891.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211121220021221 its reverse (122120022121112), we get a palindrome (333241242142333).

The spelling of 211121220021221 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".