21444101 has 4 divisors (see below), whose sum is σ = 24507552. Its totient is φ = 18380652.

The previous prime is 21444097. The next prime is 21444109. The reversal of 21444101 is 10144412.

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 21444101 - 2² = 21444097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21444101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531715 + ... + 1531728.

It is an arithmetic number, because the mean of its divisors is an integer number (6126888).

Almost surely, 2^21444101 is an apocalyptic number.

It is an amenable number.

21444101 is a deficient number, since it is larger than the sum of its proper divisors (3063451).

21444101 is an equidigital number, since it uses as much as digits as its factorization.

21444101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063450.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 21444101 is about 4630.7775804934. Note that the first 3 decimals coincide. The cubic root of 21444101 is about 277.8236939149.

Adding to 21444101 its reverse (10144412), we get a palindrome (31588513).

The spelling of 21444101 in words is "twenty-one million, four hundred forty-four thousand, one hundred one".