21103434021091 has 2 divisors, whose sum is σ = 21103434021092. Its totient is φ = 21103434021090.

The previous prime is 21103434021029. The next prime is 21103434021119. The reversal of 21103434021091 is 19012043430112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103434021091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103434321091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551717010545 + 10551717010546.

It is an arithmetic number, because the mean of its divisors is an integer number (10551717010546).

Almost surely, 2^{21103434021091} is an apocalyptic number.

21103434021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103434021091 is an equidigital number, since it uses as much as digits as its factorization.

21103434021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21103434021091 in words is "twenty-one trillion, one hundred three billion, four hundred thirty-four million, twenty-one thousand, ninety-one".