21343140823 has 2 divisors, whose sum is σ = 21343140824. Its totient is φ = 21343140822.

The previous prime is 21343140821. The next prime is 21343140827. The reversal of 21343140823 is 32804134312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21343140823 - 2¹ = 21343140821 is a prime.

Together with 21343140821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343140821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671570411 + 10671570412.

It is an arithmetic number, because the mean of its divisors is an integer number (10671570412).

Almost surely, 2^21343140823 is an apocalyptic number.

21343140823 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343140823 is an equidigital number, since it uses as much as digits as its factorization.

21343140823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 21343140823 in words is "twenty-one billion, three hundred forty-three million, one hundred forty thousand, eight hundred twenty-three".