21124421299 has 2 divisors, whose sum is σ = 21124421300. Its totient is φ = 21124421298.

The previous prime is 21124421287. The next prime is 21124421303. The reversal of 21124421299 is 99212442112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21124421299 - 2²¹ = 21122324147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21124421239) 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, 10562210649 + 10562210650.

It is an arithmetic number, because the mean of its divisors is an integer number (10562210650).

Almost surely, 2^21124421299 is an apocalyptic number.

21124421299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124421299 is an equidigital number, since it uses as much as digits as its factorization.

21124421299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The spelling of 21124421299 in words is "twenty-one billion, one hundred twenty-four million, four hundred twenty-one thousand, two hundred ninety-nine".