21024215393 has 2 divisors, whose sum is σ = 21024215394. Its totient is φ = 21024215392.

The previous prime is 21024215273. The next prime is 21024215419. The reversal of 21024215393 is 39351242012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19307936209 + 1716279184 = 138953^2 + 41428^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024215393 - 2⁸ = 21024215137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21026215393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512107696 + 10512107697.

It is an arithmetic number, because the mean of its divisors is an integer number (10512107697).

Almost surely, 2^21024215393 is an apocalyptic number.

It is an amenable number.

21024215393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024215393 is an equidigital number, since it uses as much as digits as its factorization.

21024215393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 21024215393 in words is "twenty-one billion, twenty-four million, two hundred fifteen thousand, three hundred ninety-three".