21124214393 has 2 divisors, whose sum is σ = 21124214394. Its totient is φ = 21124214392.

The previous prime is 21124214389. The next prime is 21124214411. The reversal of 21124214393 is 39341242112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16747465744 + 4376748649 = 129412^2 + 66157^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124214393 - 2² = 21124214389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21124214693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562107196 + 10562107197.

It is an arithmetic number, because the mean of its divisors is an integer number (10562107197).

Almost surely, 2^21124214393 is an apocalyptic number.

It is an amenable number.

21124214393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124214393 is an equidigital number, since it uses as much as digits as its factorization.

21124214393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The spelling of 21124214393 in words is "twenty-one billion, one hundred twenty-four million, two hundred fourteen thousand, three hundred ninety-three".