21099003847 has 2 divisors, whose sum is σ = 21099003848. Its totient is φ = 21099003846.

The previous prime is 21099003833. The next prime is 21099003857. The reversal of 21099003847 is 74830099012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21099003847 - 2⁷ = 21099003719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21099003857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10549501923 + 10549501924.

It is an arithmetic number, because the mean of its divisors is an integer number (10549501924).

Almost surely, 2^21099003847 is an apocalyptic number.

21099003847 is a deficient number, since it is larger than the sum of its proper divisors (1).

21099003847 is an equidigital number, since it uses as much as digits as its factorization.

21099003847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21099003847 in words is "twenty-one billion, ninety-nine million, three thousand, eight hundred forty-seven".