21043112039 has 2 divisors, whose sum is σ = 21043112040. Its totient is φ = 21043112038.

The previous prime is 21043112011. The next prime is 21043112063. The reversal of 21043112039 is 93021134012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21043112039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043111999 and 21043112017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043102039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521556019 + 10521556020.

It is an arithmetic number, because the mean of its divisors is an integer number (10521556020).

Almost surely, 2^21043112039 is an apocalyptic number.

21043112039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043112039 is an equidigital number, since it uses as much as digits as its factorization.

21043112039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21043112039 in words is "twenty-one billion, forty-three million, one hundred twelve thousand, thirty-nine".