211121311 has 2 divisors, whose sum is σ = 211121312. Its totient is φ = 211121310.

The previous prime is 211121299. The next prime is 211121327. The reversal of 211121311 is 113121112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211121311 - 2²¹ = 209024159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121291 and 211121300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211101311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560655 + 105560656.

It is an arithmetic number, because the mean of its divisors is an integer number (105560656).

Almost surely, 2^211121311 is an apocalyptic number.

211121311 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121311 is an equidigital number, since it uses as much as digits as its factorization.

211121311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12, while the sum is 13.

The square root of 211121311 is about 14530.0141431452. The cubic root of 211121311 is about 595.4482520068.

Adding to 211121311 its reverse (113121112), we get a palindrome (324242423).

The spelling of 211121311 in words is "two hundred eleven million, one hundred twenty-one thousand, three hundred eleven".