21099444053 has 4 divisors (see below), whose sum is σ = 21099770208. Its totient is φ = 21099117900.

The previous prime is 21099444019. The next prime is 21099444089. The reversal of 21099444053 is 35044499012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21099444053 - 2⁸ = 21099443797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21099444053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21099444253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29651 + ... + 207552.

It is an arithmetic number, because the mean of its divisors is an integer number (5274942552).

Almost surely, 2^21099444053 is an apocalyptic number.

It is an amenable number.

21099444053 is a deficient number, since it is larger than the sum of its proper divisors (326155).

21099444053 is an equidigital number, since it uses as much as digits as its factorization.

21099444053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326154.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 21099444053 in words is "twenty-one billion, ninety-nine million, four hundred forty-four thousand, fifty-three".