21101049799 has 2 divisors, whose sum is σ = 21101049800. Its totient is φ = 21101049798.

The previous prime is 21101049793. The next prime is 21101049833. The reversal of 21101049799 is 99794010112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101049799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101049793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550524899 + 10550524900.

It is an arithmetic number, because the mean of its divisors is an integer number (10550524900).

Almost surely, 2^21101049799 is an apocalyptic number.

21101049799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101049799 is an equidigital number, since it uses as much as digits as its factorization.

21101049799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 21101049799 in words is "twenty-one billion, one hundred one million, forty-nine thousand, seven hundred ninety-nine".