21103434321091 has 2 divisors, whose sum is σ = 21103434321092. Its totient is φ = 21103434321090.

The previous prime is 21103434321059. The next prime is 21103434321121. The reversal of 21103434321091 is 19012343430112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103434321091 - 2⁵ = 21103434321059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103434321391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551717160545 + 10551717160546.

It is an arithmetic number, because the mean of its divisors is an integer number (10551717160546).

Almost surely, 2^{21103434321091} is an apocalyptic number.

21103434321091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103434321091 is an equidigital number, since it uses as much as digits as its factorization.

21103434321091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21103434321091 in words is "twenty-one trillion, one hundred three billion, four hundred thirty-four million, three hundred twenty-one thousand, ninety-one".