211121311091 has 2 divisors, whose sum is σ = 211121311092. Its totient is φ = 211121311090.

The previous prime is 211121311073. The next prime is 211121311123. The reversal of 211121311091 is 190113121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211121311091 - 2¹⁴ = 211121294707 is a prime.

It is a super-2 number, since 2×211121311091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211121311591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560655545 + 105560655546.

It is an arithmetic number, because the mean of its divisors is an integer number (105560655546).

Almost surely, 2^211121311091 is an apocalyptic number.

211121311091 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121311091 is an equidigital number, since it uses as much as digits as its factorization.

211121311091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 23.

The spelling of 211121311091 in words is "two hundred eleven billion, one hundred twenty-one million, three hundred eleven thousand, ninety-one".