21444122401 has 8 divisors (see below), whose sum is σ = 23189498024. Its totient is φ = 19712436480.

The previous prime is 21444122377. The next prime is 21444122411. The reversal of 21444122401 is 10422144412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7520358400 + 13923764001 = 86720^2 + 117999^2 .

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 21444122401 - 2⁹ = 21444121889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444122411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3419166 + ... + 3425431.

It is an arithmetic number, because the mean of its divisors is an integer number (2898687253).

Almost surely, 2^21444122401 is an apocalyptic number.

It is an amenable number.

21444122401 is a deficient number, since it is larger than the sum of its proper divisors (1745375623).

21444122401 is a wasteful number, since it uses less digits than its factorization.

21444122401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844851.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21444122401 its reverse (10422144412), we get a palindrome (31866266813).

The spelling of 21444122401 in words is "twenty-one billion, four hundred forty-four million, one hundred twenty-two thousand, four hundred one".