21444551005 has 8 divisors (see below), whose sum is σ = 25734290400. Its totient is φ = 17155088016.

The previous prime is 21444550997. The next prime is 21444551017. The reversal of 21444551005 is 50015544412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21444551005 - 2³ = 21444550997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189726 + ... + 280864.

It is an arithmetic number, because the mean of its divisors is an integer number (3216786300).

Almost surely, 2^21444551005 is an apocalyptic number.

It is an amenable number.

21444551005 is a deficient number, since it is larger than the sum of its proper divisors (4289739395).

21444551005 is an equidigital number, since it uses as much as digits as its factorization.

21444551005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138203.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 21444551005 in words is "twenty-one billion, four hundred forty-four million, five hundred fifty-one thousand, five".