21241156399 has 2 divisors, whose sum is σ = 21241156400. Its totient is φ = 21241156398.

The previous prime is 21241156393. The next prime is 21241156427. The reversal of 21241156399 is 99365114212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21241156399 - 2⁷ = 21241156271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241156393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620578199 + 10620578200.

It is an arithmetic number, because the mean of its divisors is an integer number (10620578200).

Almost surely, 2^21241156399 is an apocalyptic number.

21241156399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241156399 is an equidigital number, since it uses as much as digits as its factorization.

21241156399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The spelling of 21241156399 in words is "twenty-one billion, two hundred forty-one million, one hundred fifty-six thousand, three hundred ninety-nine".