21340293911 has 2 divisors, whose sum is σ = 21340293912. Its totient is φ = 21340293910.

The previous prime is 21340293899. The next prime is 21340293913. The reversal of 21340293911 is 11939204312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21340293911 - 2⁶ = 21340293847 is a prime.

It is a Sophie Germain prime.

Together with 21340293913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340293913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670146955 + 10670146956.

It is an arithmetic number, because the mean of its divisors is an integer number (10670146956).

Almost surely, 2^21340293911 is an apocalyptic number.

21340293911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340293911 is an equidigital number, since it uses as much as digits as its factorization.

21340293911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 21340293911 in words is "twenty-one billion, three hundred forty million, two hundred ninety-three thousand, nine hundred eleven".