21234160243 has 2 divisors, whose sum is σ = 21234160244. Its totient is φ = 21234160242.

The previous prime is 21234160229. The next prime is 21234160279. The reversal of 21234160243 is 34206143212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234160243 is a prime.

It is a super-2 number, since 2×21234160243² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21234160043) 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, 10617080121 + 10617080122.

It is an arithmetic number, because the mean of its divisors is an integer number (10617080122).

Almost surely, 2^21234160243 is an apocalyptic number.

21234160243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234160243 is an equidigital number, since it uses as much as digits as its factorization.

21234160243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 21234160243 in words is "twenty-one billion, two hundred thirty-four million, one hundred sixty thousand, two hundred forty-three".