21340400404291 has 2 divisors, whose sum is σ = 21340400404292. Its totient is φ = 21340400404290.

The previous prime is 21340400404207. The next prime is 21340400404327. The reversal of 21340400404291 is 19240400404312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21340400404291 - 2¹³ = 21340400396099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21340400404391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670200202145 + 10670200202146.

It is an arithmetic number, because the mean of its divisors is an integer number (10670200202146).

Almost surely, 2^{21340400404291} is an apocalyptic number.

21340400404291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340400404291 is an equidigital number, since it uses as much as digits as its factorization.

21340400404291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 21340400404291 in words is "twenty-one trillion, three hundred forty billion, four hundred million, four hundred four thousand, two hundred ninety-one".