21030330123493 has 2 divisors, whose sum is σ = 21030330123494. Its totient is φ = 21030330123492.

The previous prime is 21030330123449. The next prime is 21030330123497. The reversal of 21030330123493 is 39432103303012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17555412846724 + 3474917276769 = 4189918^2 + 1864113^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030330123493 - 2⁹ = 21030330122981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030330123497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515165061746 + 10515165061747.

It is an arithmetic number, because the mean of its divisors is an integer number (10515165061747).

Almost surely, 2^{21030330123493} is an apocalyptic number.

It is an amenable number.

21030330123493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030330123493 is an equidigital number, since it uses as much as digits as its factorization.

21030330123493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 34.

The spelling of 21030330123493 in words is "twenty-one trillion, thirty billion, three hundred thirty million, one hundred twenty-three thousand, four hundred ninety-three".