21044299199 has 16 divisors (see below), whose sum is σ = 26258618880. Its totient is φ = 16384673760.

The previous prime is 21044299193. The next prime is 21044299217. The reversal of 21044299199 is 99199244012.

It is a de Polignac number, because none of the positive numbers 2^k-21044299199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044299193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17564 + ... + 205905.

It is an arithmetic number, because the mean of its divisors is an integer number (1641163680).

Almost surely, 2^21044299199 is an apocalyptic number.

21044299199 is a deficient number, since it is larger than the sum of its proper divisors (5214319681).

21044299199 is a wasteful number, since it uses less digits than its factorization.

21044299199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224710.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 21044299199 in words is "twenty-one billion, forty-four million, two hundred ninety-nine thousand, one hundred ninety-nine".