21359470091 has 2 divisors, whose sum is σ = 21359470092. Its totient is φ = 21359470090.

The previous prime is 21359470073. The next prime is 21359470151. The reversal of 21359470091 is 19007495312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21359470091 - 2²² = 21355275787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21359470291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10679735045 + 10679735046.

It is an arithmetic number, because the mean of its divisors is an integer number (10679735046).

Almost surely, 2^21359470091 is an apocalyptic number.

21359470091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21359470091 is an equidigital number, since it uses as much as digits as its factorization.

21359470091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 21359470091 in words is "twenty-one billion, three hundred fifty-nine million, four hundred seventy thousand, ninety-one".