21030330123239 has 2 divisors, whose sum is σ = 21030330123240. Its totient is φ = 21030330123238.

The previous prime is 21030330123221. The next prime is 21030330123293. The reversal of 21030330123239 is 93232103303012.

Together with next prime (21030330123293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030330123239 - 2²⁴ = 21030313346023 is a prime.

It is a super-2 number, since 2×21030330123239² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030330123839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515165061619 + 10515165061620.

It is an arithmetic number, because the mean of its divisors is an integer number (10515165061620).

Almost surely, 2^{21030330123239} is an apocalyptic number.

21030330123239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030330123239 is an equidigital number, since it uses as much as digits as its factorization.

21030330123239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 32.

The spelling of 21030330123239 in words is "twenty-one trillion, thirty billion, three hundred thirty million, one hundred twenty-three thousand, two hundred thirty-nine".