21111400411091 has 2 divisors, whose sum is σ = 21111400411092. Its totient is φ = 21111400411090.

The previous prime is 21111400411067. The next prime is 21111400411117. The reversal of 21111400411091 is 19011400411112.

It is an a-pointer prime, because the next prime (21111400411117) can be obtained adding 21111400411091 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111400411091 - 2¹⁸ = 21111400148947 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111400411091.

It is not a weakly prime, because it can be changed into another prime (21111400419091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555700205545 + 10555700205546.

It is an arithmetic number, because the mean of its divisors is an integer number (10555700205546).

Almost surely, 2^{21111400411091} is an apocalyptic number.

21111400411091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111400411091 is an equidigital number, since it uses as much as digits as its factorization.

21111400411091 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 21111400411091 in words is "twenty-one trillion, one hundred eleven billion, four hundred million, four hundred eleven thousand, ninety-one".