21044225051 has 8 divisors (see below), whose sum is σ = 21078301440. Its totient is φ = 21010171752.

The previous prime is 21044225023. The next prime is 21044225053. The reversal of 21044225051 is 15052244012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044225051 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 21044225051.

It is not an unprimeable number, because it can be changed into a prime (21044225053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2901836 + ... + 2909078.

It is an arithmetic number, because the mean of its divisors is an integer number (2634787680).

Almost surely, 2^21044225051 is an apocalyptic number.

21044225051 is a deficient number, since it is larger than the sum of its proper divisors (34076389).

21044225051 is an equidigital number, since it uses as much as digits as its factorization.

21044225051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11545.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 21044225051 its reverse (15052244012), we get a palindrome (36096469063).

The spelling of 21044225051 in words is "twenty-one billion, forty-four million, two hundred twenty-five thousand, fifty-one".