221111031111491 has 2 divisors, whose sum is σ = 221111031111492. Its totient is φ = 221111031111490.

The previous prime is 221111031111449. The next prime is 221111031111493. The reversal of 221111031111491 is 194111130111122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221111031111491 - 2¹⁴ = 221111031095107 is a prime.

Together with 221111031111493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221111031111493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555515555745 + 110555515555746.

It is an arithmetic number, because the mean of its divisors is an integer number (110555515555746).

Almost surely, 2^{221111031111491} is an apocalyptic number.

221111031111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111031111491 is an equidigital number, since it uses as much as digits as its factorization.

221111031111491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 29.

The spelling of 221111031111491 in words is "two hundred twenty-one trillion, one hundred eleven billion, thirty-one million, one hundred eleven thousand, four hundred ninety-one".