21044442101 has 16 divisors (see below), whose sum is σ = 21849784320. Its totient is φ = 20247297840.

The previous prime is 21044442091. The next prime is 21044442119. The reversal of 21044442101 is 10124444012.

It is not a de Polignac number, because 21044442101 - 2⁶ = 21044442037 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 (21044442131) 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, 5384390 + ... + 5388296.

It is an arithmetic number, because the mean of its divisors is an integer number (1365611520).

Almost surely, 2^21044442101 is an apocalyptic number.

It is an amenable number.

21044442101 is a deficient number, since it is larger than the sum of its proper divisors (805342219).

21044442101 is a wasteful number, since it uses less digits than its factorization.

21044442101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4904.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21044442101 its reverse (10124444012), we get a palindrome (31168886113).

The spelling of 21044442101 in words is "twenty-one billion, forty-four million, four hundred forty-two thousand, one hundred one".