21234344039 has 2 divisors, whose sum is σ = 21234344040. Its totient is φ = 21234344038.

The previous prime is 21234343973. The next prime is 21234344059. The reversal of 21234344039 is 93044343212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21234344039 - 2²⁰ = 21233295463 is a prime.

It is a super-2 number, since 2×21234344039² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234344059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617172019 + 10617172020.

It is an arithmetic number, because the mean of its divisors is an integer number (10617172020).

Almost surely, 2^21234344039 is an apocalyptic number.

21234344039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234344039 is an equidigital number, since it uses as much as digits as its factorization.

21234344039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 21234344039 in words is "twenty-one billion, two hundred thirty-four million, three hundred forty-four thousand, thirty-nine".