21143823139 has 2 divisors, whose sum is σ = 21143823140. Its totient is φ = 21143823138.

The previous prime is 21143823053. The next prime is 21143823191. The reversal of 21143823139 is 93132834112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21143823139 - 2⁹ = 21143822627 is a prime.

It is a super-2 number, since 2×21143823139² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21143823098 and 21143823107.

It is not a weakly prime, because it can be changed into another prime (21143823739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571911569 + 10571911570.

It is an arithmetic number, because the mean of its divisors is an integer number (10571911570).

Almost surely, 2^21143823139 is an apocalyptic number.

21143823139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143823139 is an equidigital number, since it uses as much as digits as its factorization.

21143823139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The spelling of 21143823139 in words is "twenty-one billion, one hundred forty-three million, eight hundred twenty-three thousand, one hundred thirty-nine".