211121021111221 has 6 divisors (see below), whose sum is σ = 228610336469730. Its totient is φ = 194880942564048.

The previous prime is 211121021111201. The next prime is 211121021111237. The reversal of 211121021111221 is 122111120121112.

211121021111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 3094890192900 + 208026130918321 = 1759230^2 + 14423111^2 .

It is not a de Polignac number, because 211121021111221 - 2²⁷ = 211120886893493 is a prime.

It is a super-2 number, since 2×211121021111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121021111201) 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, 624618405486 + ... + 624618405823.

It is an arithmetic number, because the mean of its divisors is an integer number (38101722744955).

Almost surely, 2^{211121021111221} is an apocalyptic number.

It is an amenable number.

211121021111221 is a deficient number, since it is larger than the sum of its proper divisors (17489315358509).

211121021111221 is a wasteful number, since it uses less digits than its factorization.

211121021111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249236811335 (or 1249236811322 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211121021111221 its reverse (122111120121112), we get a palindrome (333232141232333).

The spelling of 211121021111221 in words is "two hundred eleven trillion, one hundred twenty-one billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".