11211211220291 has 2 divisors, whose sum is σ = 11211211220292. Its totient is φ = 11211211220290.

The previous prime is 11211211220267. The next prime is 11211211220299. The reversal of 11211211220291 is 19202211211211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11211211220291 - 2¹⁸ = 11211210958147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11211211220291.

It is not a weakly prime, because it can be changed into another prime (11211211220299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605605610145 + 5605605610146.

It is an arithmetic number, because the mean of its divisors is an integer number (5605605610146).

Almost surely, 2^{11211211220291} is an apocalyptic number.

11211211220291 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211211220291 is an equidigital number, since it uses as much as digits as its factorization.

11211211220291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 11211211220291 in words is "eleven trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty thousand, two hundred ninety-one".