21340293899 has 2 divisors, whose sum is σ = 21340293900. Its totient is φ = 21340293898.

The previous prime is 21340293847. The next prime is 21340293911. The reversal of 21340293899 is 99839204312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21340293899 - 2⁸ = 21340293643 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21340293839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670146949 + 10670146950.

It is an arithmetic number, because the mean of its divisors is an integer number (10670146950).

Almost surely, 2^21340293899 is an apocalyptic number.

21340293899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340293899 is an equidigital number, since it uses as much as digits as its factorization.

21340293899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 21340293899 in words is "twenty-one billion, three hundred forty million, two hundred ninety-three thousand, eight hundred ninety-nine".