21343307771 has 2 divisors, whose sum is σ = 21343307772. Its totient is φ = 21343307770.

The previous prime is 21343307737. The next prime is 21343307789. The reversal of 21343307771 is 17770334312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343307771 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343304771) 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, 10671653885 + 10671653886.

It is an arithmetic number, because the mean of its divisors is an integer number (10671653886).

Almost surely, 2^21343307771 is an apocalyptic number.

21343307771 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343307771 is an equidigital number, since it uses as much as digits as its factorization.

21343307771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 38.

The spelling of 21343307771 in words is "twenty-one billion, three hundred forty-three million, three hundred seven thousand, seven hundred seventy-one".