21238379741 has 2 divisors, whose sum is σ = 21238379742. Its totient is φ = 21238379740.

The previous prime is 21238379717. The next prime is 21238379749. The reversal of 21238379741 is 14797383212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20347596025 + 890783716 = 142645^2 + 29846^2 .

It is a cyclic number.

It is not a de Polignac number, because 21238379741 - 2⁶ = 21238379677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21238379749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10619189870 + 10619189871.

It is an arithmetic number, because the mean of its divisors is an integer number (10619189871).

Almost surely, 2^21238379741 is an apocalyptic number.

It is an amenable number.

21238379741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21238379741 is an equidigital number, since it uses as much as digits as its factorization.

21238379741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The spelling of 21238379741 in words is "twenty-one billion, two hundred thirty-eight million, three hundred seventy-nine thousand, seven hundred forty-one".