21199085393 has 2 divisors, whose sum is σ = 21199085394. Its totient is φ = 21199085392.

The previous prime is 21199085381. The next prime is 21199085399. The reversal of 21199085393 is 39358099112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19942241089 + 1256844304 = 141217^2 + 35452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21199085393 - 2¹⁰ = 21199084369 is a prime.

It is not a weakly prime, because it can be changed into another prime (21199085399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10599542696 + 10599542697.

It is an arithmetic number, because the mean of its divisors is an integer number (10599542697).

Almost surely, 2^21199085393 is an apocalyptic number.

It is an amenable number.

21199085393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199085393 is an equidigital number, since it uses as much as digits as its factorization.

21199085393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 21199085393 in words is "twenty-one billion, one hundred ninety-nine million, eighty-five thousand, three hundred ninety-three".